The ecoregion partially encircles the Central Massif, which reach above and detached Knuckles Mountain Range. These mountains are represented by their own ecoregion, Sri Lanka montane rain forests. The type of the soil of the ecoregion is red-yellow podzolic soil. The extended Southwestern monsoon in May to September brings more than of rainfall to the ecoregion. The temperature remains constantly between throughout the year. Due to the proximity to the Indian Ocean daily temperatures are relieved by the ocean breezes. Relative humidity ranges between 75%-85%.