FTP, name the island, Indonesia's third largest.
Its largest river is the Sadang, which is navigable by small boats, while its surface reaches one of its highest elevations in Mount Lompobatang, an extinct volcano in the southern part of the island. Its capital is at Ujungpandang, located on the Makassar Strait; elsewhere it juts out in four  peninsulas, separated by the Gulfs of Tomini, Tolo, and Bone. FTP, name the island, Indonesia's third largest.
Its largest river is the Sadang, which is navigable by small boats, while its surface reaches one of its highest elevations in Mount Lompobatang, an extinct volcano in the southern part of the island.
Celebes