The largest city on this is the capital of Sarawak and is called Kuching, and this island is alternatively called Kalimantan by its natives.
One city on this island lies close to the Cempaka Diamond mines, and is located near the delta of the Barito River. The Dayak and Dusun people are indigenous to this island, and its tallest mountain, Mt. Kinabilu, is close to its city of Sabah. This island lies to the east of Makkasar strait, and another polity here has a large port at Muara. The largest city on this is the capital of Sarawak and is called Kuching, and this island is alternatively called Kalimantan by its natives. For 10 points, identify this island in the Indonesian archipelago which is divided among Brunei, Malaysia, and Indonesia.
One city on this island lies close to the Cempaka Diamond mines, and is located near the delta of the Barito River.
{Borneo} [accept {Kalimantan} until mentioned]