Created in DF v0.28.181.40d.
[WORLD_GEN]
[TITLE:SMALLER_TALL]
[SEED:3800758336]
[HISTORY_SEED:625643968]
[NAME_SEED:3726132736]
[DIM:33:33]
[END_YEAR:1050]
[BEAST_END_YEAR:50:60]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:0]
[ELEVATION:1:400:1600:1600]
[RAINFALL:0:100:51:51]
[TEMPERATURE:25:75:51:51]
[DRAINAGE:0:100:51:51]
[VOLCANISM:0:100:1600:1600]
[SAVAGERY:0:100:51:51]
[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:1:100:5:1:5:100]
[GOOD_SQ_COUNTS:1:16:32]
[EVIL_SQ_COUNTS:1:16:32]
[PEAK_NUMBER_MIN:1]
[OCEAN_EDGE_MIN:1]
[VOLCANO_MIN:1]
[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:0:0:0]
[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:0]
[RIVER_MINS:6:6]
[PERIODICALLY_ERODE_EXTREMES:0]
[OROGRAPHIC_PRECIPITATION:1]
[SUBREGION_MAX:2750]
[CAVE_MIN_SIZE:5]
[CAVE_MAX_SIZE:25]
[MOUNTAIN_CAVE_MIN:1]
[NON_MOUNTAIN_CAVE_MIN:3]
[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:5]
[TOTAL_CIV_POPULATION:20000]
[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]
Originally used for another location (in a community fort) that was scrapped because it didn't work with the mod we decided to use, I later took a look out of boredom and found this place.
If I remember right, somewhere the southwest corner of the region map, there's a volcano peak. Four or five region tiles directly above the volcano is a region tile with two chasm tiles and a pit in the middle of flatland. If that doesn't help I'll get a location screenshot up.