iy'Dewra'ni was one of the largest landmasses on the planet Pacifica, comparable in size to Greenland on Earth. The resort town of Eden Beach existed on the shore of iy'Dewra'ni, with several hotels, including the Eden Beach Hotel. The interior of the island, though, was the habitat for many young Selkie children and families, and thus was restricted to off-world visitors.
In 2381, in the wake of the Borg Invasion early that year, close to 80,000 individuals who had evacuated their worlds were temporarily placed at a refugee camp on iy'Dewra'ni, causing a great deal of concern and friction between the Pacifican government and the Federation. (TNG novel: Losing the Peace)