Tangkoko Batuangus Nature Reserve, Indonesian: Tangkoko-Batuangus Dua Saudara is a nature reserve in the northern part of Sulawesi island of Indonesia, 70 kilometres from Manado City. The reserve covers an area of 8,718 hectares, and includes three mountains: Mount Tangkoko at 1,109 metres, Mount Dua Saudara at 1,361 metres, and Mount Batuangus at 450 metres.

The Celebes crested macaque, also known as the crested black macaque, Sulawesi crested macaque, or the black ape, is an Old World monkey that lives in the Tangkoko reserve in the north-eastern tip of the Indonesian island of Sulawesi (Celebes), as well as on smaller neighbouring islands.