Sumerian garden of paradise, primeval land of bliss.
Dilmun is a region of high albedo on Titan, Saturn's natural satellite. (wikipedia entry)
A albedo feature is an area which shows a contrast in brightness or darkness (albedo) with adjacent areas. On Titan they are named after sacred or enchanted places, paradise, or celestial realms from legends, myths, stories, and poems of cultures from around the world.
Image Source. Marker locations are approximate and may not always appear to align with image on map.