Tropical rainforests are common in the regions experiencing heavy rainfall.In India, they are mainly prevalent in Andaman and Nicobar Islands, slopes of Western Ghats, Assam region in the North-east and also along the coast of Tamil Nadu.
Tropical rainforests are common in southern parts of India because this region experience heavy rainfall during monsoon season.Moreover the region is hot and humid with a short dry season.Hence, it is suitable for such vegetation to grow here.