The Tangkoko Nature Reserve is one of interesting location that located on the slopes of Mount Dua Saudara. It can be reached in 1 hours away from Manado. This ancient rainforest is packed with striking fauna and flora and the view of lush green hills and valleys make up the landscape of the nature reserve offer some exceptionally awesome views. Some of interesting fauna found here include anoa, black apes, cuscus, hornbill, maleo, pig deer, tarsier "smallest primate in the world", and many more.