The Cuban moist forests is a tropical moist broadleaf forest ecoregion that occupies 21,400 km2 (8,300 sq mi; 5,300,000 acres) on Cuba and Isla de la Juventud. The ecoregion receives more than 2,000 mm (79 in) of rainfall annually, and does not have a dry season. Soils are usually derived from quartz, limestone, or serpentinites. Cuban moist forests can be differentiated into lowland forests (sea level to 400 m or 1,300 ft), sub-montane forests (400–800 m or 1,300–2,600 ft), and montane forests (800–1,900 m or 2,600–6,200 ft).