You'd embark in the north/center region (i.e. inside the "ocean" in the single good desert tile (towards the southern end of the area). Once your focus is in that world tile, you'd run this DFHack script:
function regionembark ()
-- [Y], [X] for split_x, [X], [Y] for split_y
local split = {[0] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 47, y = 47},
[8] = {x = 23, y = 23}, [9] = {x = 0, y = 0}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[1] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 47, y = 47},
[8] = {x = 23, y = 23}, [9] = {x = 0, y = 0}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[2] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 47, y = 47},
[8] = {x = 23, y = 23}, [9] = {x = 0, y = 0}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[3] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 47, y = 47},
[8] = {x = 23, y = 23}, [9] = {x = 0, y = 0}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[4] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 47, y = 47},
[8] = {x = 23, y = 23}, [9] = {x = 0, y = 0}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[5] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 47, y = 47},
[8] = {x = 23, y = 23}, [9] = {x = 0, y = 0}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[6] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 47, y = 47},
[8] = {x = 23, y = 23}, [9] = {x = 0, y = 0}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[7] = {[0] = {x = 0, y = 47}, [1] = {x = 0, y = 47}, [2] = {x = 0, y = 47}, [3] = {x = 0, y = 47},
[4] = {x = 0, y = 47}, [5] = {x = 0, y = 47}, [6] = {x = 0, y = 47}, [7] = {x = 23, y = 23},
[8] = {x = 23, y = 23}, [9] = {x = 23, y = 23}, [10] = {x = 0, y = 47}, [11] = {x = 0, y = 47},
[12] = {x = 0, y = 47}, [13] = {x = 0, y = 47}, [14] = {x = 0, y = 47}, [15] = {x = 0, y = 47}},
[8] = {[0] = {x = 0, y = 47}, [1] = {x = 0, y = 47}, [2] = {x = 0, y = 47}, [3] = {x = 0, y = 47},
[4] = {x = 0, y = 47}, [5] = {x = 0, y = 47}, [6] = {x = 0, y = 47}, [7] = {x = 0, y = 47},
[8] = {x = 12, y = 36}, [9] = {x = 0, y = 47}, [10] = {x = 0, y = 47}, [11] = {x = 0, y = 47},
[12] = {x = 0, y = 47}, [13] = {x = 0, y = 47}, [14] = {x = 0, y = 47}, [15] = {x = 0, y = 47}},
[9] = {[0] = {x = 0, y = 47}, [1] = {x = 0, y = 47}, [2] = {x = 0, y = 47}, [3] = {x = 0, y = 47},
[4] = {x = 0, y = 47}, [5] = {x = 0, y = 47}, [6] = {x = 0, y = 47}, [7] = {x = 23, y = 23},
[8] = {x = 23, y = 23}, [9] = {x = 23, y = 23}, [10] = {x = 0, y = 47}, [11] = {x = 0, y = 47},
[12] = {x = 0, y = 47}, [13] = {x = 0, y = 47}, [14] = {x = 0, y = 47}, [15] = {x = 0, y = 47}},
[10] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 0, y = 47},
[8] = {x = 0, y = 47}, [9] = {x = 0, y = 47}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[11] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 0, y = 47},
[8] = {x = 0, y = 47}, [9] = {x = 0, y = 47}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[12] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 0, y = 47},
[8] = {x = 0, y = 47}, [9] = {x = 0, y = 47}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[13] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 0, y = 47},
[8] = {x = 0, y = 47}, [9] = {x = 0, y = 47}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[14] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 0, y = 47},
[8] = {x = 0, y = 47}, [9] = {x = 0, y = 47}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}},
[15] = {[0] = {x = 47, y = 47}, [1] = {x = 47, y = 47}, [2] = {x = 47, y = 47}, [3] = {x = 47, y = 47},
[4] = {x = 47, y = 47}, [5] = {x = 47, y = 47}, [6] = {x = 47, y = 47}, [7] = {x = 0, y = 47},
[8] = {x = 0, y = 47}, [9] = {x = 0, y = 47}, [10] = {x = 0, y = 0}, [11] = {x = 0, y = 0},
[12] = {x = 0, y = 0}, [13] = {x = 0, y = 0}, [14] = {x = 0, y = 0}, [15] = {x = 0, y = 0}}}
-- [Y], [X]
local biome_corner = {[0] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[1] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[2] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[3] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[4] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[5] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[6] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[7] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[8] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[9] = {[0] = 2, [1] = 2, [2] = 2, [3] = 2, [4] = 2, [5] = 2, [6] = 2, [7] = 2,
[8] = 3, [9] = 3, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3},
[10] = {[0] = 2, [1] = 2, [2] = 2, [3] = 2, [4] = 2, [5] = 2, [6] = 2, [7] = 2,
[8] = 3, [9] = 3, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3},
[11] = {[0] = 2, [1] = 2, [2] = 2, [3] = 2, [4] = 2, [5] = 2, [6] = 2, [7] = 2,
[8] = 3, [9] = 3, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3},
[12] = {[0] = 2, [1] = 2, [2] = 2, [3] = 2, [4] = 2, [5] = 2, [6] = 2, [7] = 2,
[8] = 3, [9] = 3, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3},
[13] = {[0] = 2, [1] = 2, [2] = 2, [3] = 2, [4] = 2, [5] = 2, [6] = 2, [7] = 2,
[8] = 3, [9] = 3, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3},
[14] = {[0] = 2, [1] = 2, [2] = 2, [3] = 2, [4] = 2, [5] = 2, [6] = 2, [7] = 2,
[8] = 3, [9] = 3, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3},
[15] = {[0] = 2, [1] = 2, [2] = 2, [3] = 2, [4] = 2, [5] = 2, [6] = 2, [7] = 2,
[8] = 3, [9] = 3, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3}}
-- [Y], [X] for biome_x, [X], [Y] for biome_y
local biome = {[0] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 0, [9] = 0, [10] = 0, [11] = 0, [12] = 0, [13] = 0, [14] = 0, [15] = 0},
[1] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 0, [9] = 0, [10] = 0, [11] = 0, [12] = 0, [13] = 0, [14] = 0, [15] = 0},
[2] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 0, [9] = 0, [10] = 0, [11] = 0, [12] = 0, [13] = 0, [14] = 0, [15] = 0},
[3] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 0, [9] = 0, [10] = 0, [11] = 0, [12] = 0, [13] = 0, [14] = 0, [15] = 0},
[4] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 0, [9] = 0, [10] = 0, [11] = 0, [12] = 0, [13] = 0, [14] = 0, [15] = 0},
[5] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 0, [9] = 0, [10] = 0, [11] = 0, [12] = 0, [13] = 0, [14] = 0, [15] = 0},
[6] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 0, [9] = 0, [10] = 0, [11] = 0, [12] = 0, [13] = 0, [14] = 0, [15] = 0},
[7] = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0,
[8] = 0, [9] = 0, [10] = 0, [11] = 0, [12] = 0, [13] = 0, [14] = 0, [15] = 0},
[8] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 1,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[9] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 1,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[10] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 1,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[11] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 1,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[12] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 1,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[13] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 1,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[14] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 1,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1},
[15] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 1,
[8] = 1, [9] = 1, [10] = 1, [11] = 1, [12] = 1, [13] = 1, [14] = 1, [15] = 1}}
-- [Y], [X]
local biome_ref =
{[0] = {[0] = 7, [1] = 7, [2] = 7, [3] = 7, [4] = 7, [5] = 7, [6] = 7, [7] = 8,
[8] = 8, [9] = 8, [10] = 9, [11] = 9, [12] = 9, [13] = 9, [14] = 9, [15] = 9},
[1] = {[0] = 7, [1] = 7, [2] = 7, [3] = 7, [4] = 7, [5] = 7, [6] = 7, [7] = 8,
[8] = 8, [9] = 8, [10] = 9, [11] = 9, [12] = 9, [13] = 9, [14] = 9, [15] = 9},
[2] = {[0] = 7, [1] = 7, [2] = 7, [3] = 7, [4] = 7, [5] = 7, [6] = 7, [7] = 8,
[8] = 8, [9] = 8, [10] = 9, [11] = 9, [12] = 9, [13] = 9, [14] = 9, [15] = 9},
[3] = {[0] = 7, [1] = 7, [2] = 7, [3] = 7, [4] = 7, [5] = 7, [6] = 7, [7] = 8,
[8] = 8, [9] = 8, [10] = 9, [11] = 9, [12] = 9, [13] = 9, [14] = 9, [15] = 9},
[4] = {[0] = 7, [1] = 7, [2] = 7, [3] = 7, [4] = 7, [5] = 7, [6] = 7, [7] = 8,
[8] = 8, [9] = 8, [10] = 9, [11] = 9, [12] = 9, [13] = 9, [14] = 9, [15] = 9},
[5] = {[0] = 7, [1] = 7, [2] = 7, [3] = 7, [4] = 7, [5] = 7, [6] = 7, [7] = 8,
[8] = 8, [9] = 8, [10] = 9, [11] = 9, [12] = 9, [13] = 9, [14] = 9, [15] = 9},
[6] = {[0] = 7, [1] = 7, [2] = 7, [3] = 7, [4] = 7, [5] = 7, [6] = 7, [7] = 8,
[8] = 8, [9] = 8, [10] = 9, [11] = 9, [12] = 9, [13] = 9, [14] = 9, [15] = 9},
[7] = {[0] = 4, [1] = 4, [2] = 4, [3] = 4, [4] = 4, [5] = 4, [6] = 4, [7] = 7,
[8] = 8, [9] = 9, [10] = 6, [11] = 6, [12] = 6, [13] = 6, [14] = 6, [15] = 6},
[8] = {[0] = 4, [1] = 4, [2] = 4, [3] = 4, [4] = 4, [5] = 4, [6] = 4, [7] = 4,
[8] = 5, [9] = 6, [10] = 6, [11] = 6, [12] = 6, [13] = 6, [14] = 6, [15] = 6},
[9] = {[0] = 4, [1] = 4, [2] = 4, [3] = 4, [4] = 4, [5] = 4, [6] = 4, [7] = 1,
[8] = 2, [9] = 3, [10] = 6, [11] = 6, [12] = 6, [13] = 6, [14] = 6, [15] = 6},
[10] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 2,
[8] = 2, [9] = 2, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3},
[11] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 2,
[8] = 2, [9] = 2, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3},
[12] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 2,
[8] = 2, [9] = 2, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3},
[13] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 2,
[8] = 2, [9] = 2, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3},
[14] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 2,
[8] = 2, [9] = 2, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3},
[15] = {[0] = 1, [1] = 1, [2] = 1, [3] = 1, [4] = 1, [5] = 1, [6] = 1, [7] = 2,
[8] = 2, [9] = 2, [10] = 3, [11] = 3, [12] = 3, [13] = 3, [14] = 3, [15] = 3}}
for x = 0, 15 do
for y = 0, 15 do
df.global.world.world_data.region_details [0].edges.split_x [x] [y] = split [y] [x]
df.global.world.world_data.region_details [0].edges.split_y [x] [y] = split [x] [y]
df.global.world.world_data.region_details [0].edges.biome_corner [x] [y] = biome_corner [y] [x]
df.global.world.world_data.region_details [0].edges.biome_x [x] [y] = biome [y] [x]
df.global.world.world_data.region_details [0].edges.biome_y [x] [y] = biome [x] [y]
df.global.world.world_data.region_details [0].biome [x] [y] = biome_ref [y] [x]
end
end
end
regionembark()
The script hacks the mid level tiles to generate a 3*3 area with 9 biomes close to the center of the map, which is the intended embark area. Note that the effects of the script are removed if you move the focus to a different world tile and back (but you can run the script again). It's possible to generate the same kind of multi region embark using the Region Manipulator, but this script predates that tool, as well as does exactly what I want with a single command.
Edit: I screwed up the zip file, and accidentally provided one with a bug report save. I've corrected the link above (the file names differ with a blank character...).