Sinharaja Forest Reserve is the largest lowland rainforest in Sri Lanka. This Unesco-listed, richly biodiverse habitat, bordered by rivers, is rich in wildlife, including rare mammals and many endemic birds. Unlike most Sri Lankan national parks, access to the forest is only on foot, accompanied by a ranger or guide. Most visitors base themselves in the nearby settlements of Deniyaya or Kudawa.
Because the forest is so dense, wildlife-spotting is not as easy here as it is in many other Sri Lankan reserves and parks. A good guide certainly helps. Note that although visitors are only allowed to walk through the reserve, local villagers are permitted to drive motorbikes along trails as short cuts to get around, disturbing the peace somewhat.