The area of Kassalang is situated far away from human settlements that make it special for nature lovers.

[5] Kassalang reserve forest is located 11 km (6.83 mi) north-east of Baghaichari Upazila, Rangamati.

Kassalang shares its border with Sajek Valley and Dighinala to the south, Panchhari to the west, Indian state of Tripura to the north and Mizoram to the east.

Lungsir Tlang Mountain range passes through Kassalang reserve forest.

Kassalang typically receives about 141.7 millimeters (5.58 inches) of precipitation and has 159.23 rainy days (43.62% of the time) annually.

Kassalong is also one of the country's most dense forests decorated with a large diverse floral system.

The most important commercial timber species of the Kassalang reserve forest is Pitraj, Civit, Jarul, Gamar, Koroi, Garjan, Chapalish, Toon, Champa, Batna, Udal, Simul, Chandul, etc.

There are some Deciduous and Semi-deciduous trees, so the forest never loses its semi-evergreen look and remain green all year round.

Asian elephant, Western hoolock gibbon, Dhole, Bengal fox, Golden jackal, Wild boar, Rhesus macaque, Capped langur, Southern red muntjac, Sambar deer, Hog deer, Gaur, Asian black bear, Indian leopard, Himalayan serow, Clouded leopard, Asian golden cat, Marbled cat, Burmese python, Arakan forest turtle are the supreme wild species.

[11][12] Kassalong reserve forest has the highest density of Clouded leopard in the country.

The most rare species; Gaur and Himalayan red serow also had discovered in some camera trap images.

There are some big mountain ranges along with a lot of small hills and ridges with high grasslands.

Forest areas like Kassalong provides a vast working place for the forestry and wildlife researchers.