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One city and 12 out of the 23 municipalities of the Province of Palawan are on this island. Iwahig Prison and Penal Farm, one of seven operating units of the Bureau of Corrections, is located on the island.

Geography

The entire length of the island forms a mountain range, with a peak altitude of 2,086 meters (6,844 ft) at Mount Mantalingajan. Other significant peaks include Mount Gantung (1,788 meters (5,866 ft)) in Batazara and Victoria Peak (1,726 meters (5,663 ft)) in Narra. The outlying islands include Cagayancillo to the far east, Dumaran Island and the more distant Cuyo Archipelago are to the northeast, and Linapacan and Busuanga Island nearby in the north-northeast. The archipelago of Kalayaan Municipality is to the far west, while Balabac Municipality is south of the island's western edge.

Geology

The geology of Palawan is, in many ways, unlike other parts of the Philippines. The crust of northeast Palawan was derived from the southeast edge of the continental crust of China, part of the Eurasian Plate. It is the exposed portion of a microcontinent that drifted southward with the opening of the South China Sea, and forms the shallow waters north of Palawan in the Reed Bank-Dangerous Ground area of the southern South China Sea. Some of the oldest rocks in the Philippines are found in northeast Palawan (Permian-Carboniferous age). Southwest Palawan exposes primarily ophiolitic material (rocks derived from uplifted oceanic crust and mantle). This 34 Mya old (latest Eocene-earliest Oligocene) ophiolite appears to have been thrust upon the continental crust as well as the older, Cretaceous ophiolitic and sedimentary units. The transition from "oceanic" ophiolite in the southwest to "continental"-type rocks in the northeast occurs in the area of central Palawan around Ulugan Bay and the Sabang area, in the southern coasts of which are several exposures showing Palawan ophiolite having been thrust onto continent-derived clastic rocks ("Sabang thrust").

The Palawan Trough is an area of deeper water adjacent to the north coast of Palawan in the South China Sea. The Palawan Trough is thought to exist due to downbending of the continental crust due to the weight of the ophiolite thrust sheet.

Further north, around the Malampaya Sound area and up to the El Nido area, one finds older (Triassic-Jurassic) deep marine chert and limestone. The limestone forms spectacular karst terrain. These units are part of the microcontinent ("North Palawan Block") although they are deep marine rocks marginal to the continental crust. They were accreted to the Chinese continental crust in the Mesozoic at a time when an Andean-type subduction zone existed in southeast China.

Intruding these rocks in central Palawan (Cleopatra's Needle area) and northern Palawan (Mount Capoas or Kapoas area) are young granite bodies (true granite to granodiorite). The Kapoas intrusion is of Miocene age (13-15 million years old based on zircon and monazite U-Pb dating). In the Taytay area of northern Palawan, a young basaltic cinder cone is another manifestation of young magmatic activity. The granitic magmatism and basaltic magmatism are both expressions of what has been identified as a widespread post-South China Sea spreading magmatism that has affected many areas around the South China Sea.

Tectonically, Palawan with the Calamian Islands, is considered to be a north-east extension of the Sunda Plate, in collision with the Philippine Mobile Belt at Mindoro.

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