Bambarabotuwa forest reserve covered by 4540 hectares.

The Bambarabotuwa forest was declared as a reserve by the Gazette Extraordinary of 5003/4.7.1890. It is a thick jungle containing Mahogany plantations with 10 hectares of Hora trees cultivated by the Forest Department. Moreover there are streams running through the forest that feed the downstream river. The land that has been identified is already under forest cover and serves as a catchments area for this river.

Diyadawa Declared a reserve in 1936, Diyadawa extends some 2,578.9 hectares.

For centuries, there have been hamlets on the banks of the Gin Ganga with a few settlements located within Sinharaja. Mass settlement commenced in the early Seventies and today, most are second generation encroachers believing in their right to cultivate and dwell there.

Tropical lowland rain forest in Sri Lanka . Area: 20,139

Kanneliya-Dediyagala-Nakiyadeniya (KDN) Biosphere Reserve, which covers lowland and mountain tropical forests, occupies the interlude between two rivers. The Gin and Nilwala Rivers , which feeds numerous rivers and streams. They drain into the Indian Ocean near the world famous coral reefs of the Hikkaduwa Marine Sanctuary. These two rivers are vital for the regional agricultural and industrial development in the Galle and Matara Districts.

The Yagirala Forest Reserve is situated in the Kalutara district in the Western Province of  Sri Lanka. Area:     2004.9 hectares
Latitude:   6 o 21'  -  6 o 26' N
Longitude:  80 o 06'  -  80 o 11' E
Access:   Yagirala Forest Reserve is approximately 90 kilometers from the Capital city of Colombo .

Elevation: Ranges from 10 metres to 260 metres above mean sea level(MSL).
The highest points of the area are Katukithulana (868m above MSL) and Pamaragala (842m above MSL).
Climatic Zone: Wet zone of the island. Approximately 4000mm of rainfall per year.
Temperature range:  27.0 o C to 28.5 o C.