i was playing adventure mode, playing a dwarf heading to the mountainhome, when i'm almost there, i run into so many lairs i cant fast travel past them, or easily move around
so i retired the adventurer, and tried to embark there,
and no matter where i start near that river, i get at least 10 lairs, sometimes up to 20, in one 5x5 embark

time for SCIENCE! ?

very small world, the lairs are next to the river that goes right up to the mountainhome, many revealed by adventure mode

relevant thread on bay 12 forums, where i was asked for the save file:
http://www.bay12forums.com/smf/index.php?topic=137607.0

dwarf fortress version 34.11

very few modifications to the raws, mostly made armadillos domesticated, due to shell moods
retired adventurers may have dfhack summoned gear, i was planning on some adventurer-migrant science when i ran into the lair cluster, and the test group adventurers kept dying before reaching their retire-locations.
several retired adventurers are necromancers, for extra fun(one of the things i was PLANNING to test)