Kuching is located on the banks of the Sarawak River in the northwestern part of the island of Borneo. The limits of the City of Kuching include all that area in Kuching District containing an area approximately bounded from Gunung Lasak (Mount Lasak) in Muara Tebas to Batu Buaya (Crocodile Rock) in the Santubong peninsula following a series of survey marks as stated in the First Schedule of the City of Kuching Ordinance, 1988. As a simplification of the legal statute, the Kuching city limits extend from the Kuching International Airport in the south to the northern coast of the Santubong and Bako peninsulas; from the Kuching Wetlands National Park in the west to the Kuap River estuary in the east. The Sarawak River generally splits the city into North and South. The highest point in the city is Mount Santubong on the Santubong peninsula, which is at above sea level, located 35 km north of the city centre. Rapid urbanisation has occurred in Greater Kuching and the urban sprawl extends to Penrissen, Kota Sentosa, Kota Padawan, Batu Kawah, Matang, Samariang, Siburan, Tarat, Kota Samarahan, Asajaya as well as Serian which is located about 65 km from Kuching.