Sarawak is situated on the island of Borneo, and is one of the two states that make up East Malaysia. Sarawak and Sabah are separated from West Malaysia (Peninsula Malaysia) by the South China Sea about 600 km away. With an area of 124,449.51 square km, Sarawak is the largest state in Malaysia, making up some 37.5 per cent of the country's total area.

The State is bounded on the north and northwest by the South China Sea, the northeast by Sabah and Brunei Darussalam, which forms a double enclave, and the south by Kalimantan, Indonesia. Sarawak can be classified into three terrain groups: the alluvial coastal plain, the mountainous interior and the central undulating belt. Sarawak's highest point is Gunung Murut (2,434 m). Malaysia's longest river, the Batang Rajang, glides through the State.