Sembilang National Park is a national park covering 2,051 km² along the east coast of Sumatra, Indonesia. The park is dominated by swamps as peat forests, like the neighbouring Berbak National Park, and both parks are Ramsar wetlands of international importance. The park is considered to have the most complex shorebird community in the world, with 213 species recoded, and supports the world's largest breeding colony of milky storks.