I posted this in a different thread, but you might want it as it gives you everything that you want...
This is a Medium world for 40d9 that has 2 fantastic spots.
At least one of them can be done as a 3x4, maybe both of them. I was focused on a 4x4, but I did check for a 3x4 and a 3x5 at one point, and I believe they worked.
Spot one (4x4)
cold
Sand
Magma Pipe (not visible on surface)
Flux Stone
Underground river
Other Features (I assume HSF)
Trees
Chasm (dried river bed style with critters)
Extremely savage Neutral area with lots of critters (can be redesigned to turn this from neutral to Evil with a little effort)
Elves/Dwarves/Goblins/Humans/Orcs (if you mod Orcs)
around 25 z-levels that can be mined
This area is right next to a brook, so if you make it a 5x4 you can add a brook
Spot two (4x4)
Magma Pipe (not visible on surface)
Flux Stone
Underground river
Other Features (I assume HSF)
Trees
2 Chasm (giant round pits with critters)
Extremely savage Neutral area with lots of critters including a Gremlin (can be redesigned to turn this from neutral to Evil with a little effort)
Elves/Dwarves/Goblins/Humans/Orcs (if you mod Orcs)
32 z-levels that can be mined
This area is right next to a brook, so if you make it a 5x4 you can add a brook and sand
One of these sites also has an underground pool, but I am not sure which one.
I am using the 2nd spot as a 6x6 so I have literally everything I could use. I wanted to test the FPS with 40d9 on my extremely top end system, so I went with a large size. I started with 3 or 4 pages of creatures.
Here is the seed info:
[TITLE:MEDIUM]
[SEED:309397958]
[HISTORY_SEED:25833462]
[NAME_SEED:934484358]
[DIM:129:129]
[END_YEAR:1050]
[BEAST_END_YEAR:175:20]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:0]
[ELEVATION:1:400:401:401]
[RAINFALL:0:100:200:200]
[TEMPERATURE:25:75:200:200]
[DRAINAGE:0:100:200:200]
[VOLCANISM:0:100:1600:800]
[SAVAGERY:20:100:200:200]
[ELEVATION_FREQUENCY:1:1:1:1:1:1]
[RAIN_FREQUENCY:1:1:1:1:1:1]
[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:1:1:1:10:1:1]
[GOOD_SQ_COUNTS:10:50:100]
[EVIL_SQ_COUNTS:10:50:100]
[PEAK_NUMBER_MIN:12]
[OCEAN_EDGE_MIN:1]
[VOLCANO_MIN:125]
[REGION_COUNTS:SWAMP:260:1:1]
[REGION_COUNTS:DESERT:260:1:1]
[REGION_COUNTS:FOREST:1040:3:3]
[REGION_COUNTS:MOUNTAINS:2080:2:2]
[REGION_COUNTS:OCEAN:2080:1:1]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:2080:3:3]
[REGION_COUNTS:HILLS:2080:3:3]
[EROSION_CYCLE_COUNT:10]
[RIVER_MINS:800:100]
[PERIODICALLY_ERODE_EXTREMES:0]
[OROGRAPHIC_PRECIPITATION:1]
[SUBREGION_MAX:2750]
[CAVE_MIN_SIZE:10]
[CAVE_MAX_SIZE:25]
[MOUNTAIN_CAVE_MIN:100]
[NON_MOUNTAIN_CAVE_MIN:100]
[ALL_CAVES_VISIBLE:0]
[SHOW_EMBARK_RIVER:2]
[SHOW_EMBARK_POOL:2]
[SHOW_EMBARK_M_POOL:2]
[SHOW_EMBARK_M_PIPE:2]
[SHOW_EMBARK_CHASM:2]
[SHOW_EMBARK_PIT:2]
[SHOW_EMBARK_OTHER:2]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:20]
[TOTAL_CIV_POPULATION:20000]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:2080:4160:2080]
[RAIN_RANGES:2080:4160:2080]
[DRAINAGE_RANGES:2080:4160:2080]
[SAVAGERY_RANGES:2080:4160:2080]
[VOLCANISM_RANGES:2080:4160:2080]
Maybe that helps...
- Livonya