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[Geozo]

As none of you may remember, I posted my first thread in 2010. So here I am again, in this bright and shiny 5 years later world with the same question. Can I recreate castaway?

My question was, what sort of perimeters, if any, I could set so that I could generate an island small enough to fit entirely on my embark boundaries. That is, is there any way to generate an island small enough that I can embark on that will be completely surrounded by coasts. I can't figure out how. I've gotten very close, but it's just slightly too large and will crash my game. Has anyone found a nice 5x5 or 3x3 island? How did you do it? Will the game even load if you have no place from which traders and raiders can enter your map?

[iofhua]

You could try something like this:
(DF 34.11)

Spoiler (click to show/hide)

[WORLD_GEN]
   [TITLE:CUSTOM ISLAND]
   [DIM:17:17]
   [EMBARK_POINTS:10000]
   [END_YEAR:500]
   [BEAST_END_YEAR:2:50]
   [REVEAL_ALL_HISTORY:1]
   [CULL_HISTORICAL_FIGURES:0]
   [ELEVATION:1:100:3200:3200]
   [RAINFALL:0:100:400:400]
   [TEMPERATURE:50:70:20:20]
   [DRAINAGE:0:100:400:400]
   [VOLCANISM:100:100:3200:3200]
   [SAVAGERY:0:100:400:400]
   [ELEVATION_FREQUENCY:2:10:1:1:1:1]
   [RAIN_FREQUENCY:2:1:1:1:1:10]
   [DRAINAGE_FREQUENCY:1:1:1:1:1:1]
   [TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
   [SAVAGERY_FREQUENCY:1:1:1:1:1:1]
   [VOLCANISM_FREQUENCY:1:1:1:1:1:1]
   [MINERAL_SCARCITY:1000]
   [MEGABEAST_CAP:5]
   [SEMIMEGABEAST_CAP:5]
   [TITAN_NUMBER:5]
   [TITAN_ATTACK_TRIGGER:100:0:250000]
   [DEMON_NUMBER:20]
   [NIGHT_TROLL_NUMBER:10]
   [BOGEYMAN_NUMBER:10]
   [VAMPIRE_NUMBER:10]
   [WEREBEAST_NUMBER:10]
   [SECRET_NUMBER:1000]
   [REGIONAL_INTERACTION_NUMBER:10]
   [DISTURBANCE_INTERACTION_NUMBER:100]
   [EVIL_CLOUD_NUMBER:10]
   [EVIL_RAIN_NUMBER:10]
   [GOOD_SQ_COUNTS:0:0:0]
   [EVIL_SQ_COUNTS:0:0:0]
   [PEAK_NUMBER_MIN:0]
   [PARTIAL_OCEAN_EDGE_MIN:0]
   [COMPLETE_OCEAN_EDGE_MIN:4]
   [VOLCANO_MIN:35]
   [REGION_COUNTS:SWAMP:0:0:0]
   [REGION_COUNTS:DESERT:0:0:0]
   [REGION_COUNTS:FOREST:0:0:0]
   [REGION_COUNTS:MOUNTAINS:0:0:0]
   [REGION_COUNTS:OCEAN:135:0:0]
   [REGION_COUNTS:GLACIER:0:0:0]
   [REGION_COUNTS:TUNDRA:0:0:0]
   [REGION_COUNTS:GRASSLAND:0:0:0]
   [REGION_COUNTS:HILLS:0:0:0]
   [EROSION_CYCLE_COUNT:10]
   [RIVER_MINS:0:0]
   [PERIODICALLY_ERODE_EXTREMES:1]
   [OROGRAPHIC_PRECIPITATION:1]
   [SUBREGION_MAX:5000]
   [CAVERN_LAYER_COUNT:3]
   [CAVERN_LAYER_OPENNESS_MIN:60]
   [CAVERN_LAYER_OPENNESS_MAX:80]
   [CAVERN_LAYER_PASSAGE_DENSITY_MIN:40]
   [CAVERN_LAYER_PASSAGE_DENSITY_MAX:60]
   [CAVERN_LAYER_WATER_MIN:20]
   [CAVERN_LAYER_WATER_MAX:40]
   [HAVE_BOTTOM_LAYER_1:1]
   [HAVE_BOTTOM_LAYER_2:1]
   [LEVELS_ABOVE_GROUND:10]
   [LEVELS_ABOVE_LAYER_1:15]
   [LEVELS_ABOVE_LAYER_2:1]
   [LEVELS_ABOVE_LAYER_3:1]
   [LEVELS_ABOVE_LAYER_4:10]
   [LEVELS_ABOVE_LAYER_5:10]
   [LEVELS_AT_BOTTOM:1]
   [CAVE_MIN_SIZE:10]
   [CAVE_MAX_SIZE:25]
   [MOUNTAIN_CAVE_MIN:1]
   [NON_MOUNTAIN_CAVE_MIN:1]
   [ALL_CAVES_VISIBLE:0]
   [SHOW_EMBARK_TUNNEL:2]
   [TOTAL_CIV_NUMBER:5]
   [TOTAL_CIV_POPULATION:-1]
   [SITE_CAP:5]
   [PLAYABLE_CIVILIZATION_REQUIRED:1]
   [ELEVATION_RANGES:0:0:0]
   [RAIN_RANGES:0:0:0]
   [DRAINAGE_RANGES:0:0:0]
   [SAVAGERY_RANGES:0:0:0]
   [VOLCANISM_RANGES:0:0:0]

Basically set it to 4 complete edge oceans with the minimum number of ocean to like half the map. Use a mesh for elevation that heavily weights low elevation and a rain mesh that heavily weights high amounts of rain. Throw in a bunch of volcanoes - but not too many. Lone volcanoes will create a small island around them, but clusters of volcanoes will create larger islands.

This type of map won't spawn a lot of other civs, and some might not be able to spawn at all. But you should get an island all to yourself this way.

I haven't seen a 4x4 island, though. The volcano islands are still much bigger than that.

[Antikythera]

and I thought this thread was going to be about "Saving Private Urist's sock."

I've not seen islands that are smaller than the middle embark region (is that 16 x 16).
perhaps find a peninsular and send in a terraforming team to channel out the isthmus.

[§k]

It should not be difficult if you include the island (which could be artificial) and los angeles in one normal coastal embark.

The radius of dwarven sight is only 20 tiles. A small obsidian formation 30 tiles from the land is "in the middle of nowhere", for a dwarf.

[draeath]

You should checkout the hermit mode in DF Masterwork 6.x... sounds right up your alley.