Dungeons & Dragons
The Moonsea is a region in the Western Heartlands of Faerûn, north of the Dalelands, named after the body of water at the center of the region connected to the Sea of Fallen Stars by the River Lis. The city-states in this region border the water, but the terrain bordering the sea consists not only of forests, mountains, and moors, but also bands of marauders and thieves, so if you are at any given one, the others are easily reachable by sea, but not necessarily land. There is no capital, rather, each city-state is ruled by its own despot. Zhentil Keep, the previous base of operations of the Zhentarim, is on the western edge of the Moonsea; Hillsfar lay in the southwest and Mulmaster in the southeast; and Melvaunt and Phlan on the northern side.