Sangalaki Island

Sangalaki Island is a small uninhabited island in the Derawan Archipelago, located in Pulau Derawan Sub-district, Berau Regency, East Kalimantan, Indonesia. Part of the Berau Marine Conservation Area, it is internationally known for its seasonal aggregation of manta rays and as a major nesting site for green sea turtles. The island features white sandy beaches, shallow coral reefs and clear waters, and is visited primarily for snorkeling and diving day trips from Derawan or Maratua.

Visitors can expect a small, flat, uninhabited island with white sandy beaches, clear turquoise water and fringing coral reefs. The interior is sandy with coastal vegetation and turtle nesting areas. There are no permanent settlements, only a jetty and ranger post. Access is by boat on day trips from Derawan, Maratua or Tanjung Batu. Activities center on snorkeling and diving to see manta rays, sea turtles and reef fish, plus beach walking and photography.