These are forest associated with rivers and their flood plains. An interesting marsh forest is the Waturana forest, (12 ha) located in Kalu ganga basin. Two endemic plants are present Mesua stylosa and Stemonoporus moonii. Mahaweli ganga associated riverine forest dry zone is very rich in biodiversity and highly productive. All dry zone rivers form an important habitat for wild life especially large grazing animals like elephants, deer and buffalo.