The eastern Caribbean lowlands of Nicaragua form the extensive and exaggerated (occupying more than 50 percent of national territory) and still sparsely settled lowland area known as the Costa de Mosquitos (Miskito Coast). The Caribbean lowlands are sometimes considered synonymous with the former department of Zelaya, which is now divided into the North Caribbean Coast Autonomous Region (Región Autónoma de la Costa Caribe Norte, RACCN) and the South Caribbean Coast Autonomous Region (Región Autónoma de la Costa Caribe Sur, RACCS) and constitutes about 45 percent of Nicaragua's territory.