A small marsh is the center of life of the exile colony of “undesirable” Yuan-ti. It has become the in-destination of pureblood exiles (political and criminal) and the go-to place for Anathema, Whisperers, Malisons and mixbreeds that want to live beyond what Yuan-ti society deems right for their “body-type”.
Their main town, Gosoni, is an appropriated great black dragon lair that has not been occupied for millennia. 3 Generations ago they tried to expand their swamp through dams, but were thwarted by their neighbors Manes.