Cedros Island is an island in the Pacific Ocean belonging to the state of Baja California, Mexico. The dry and rocky island had a population of 1,350 in 2005 and has an area of 348 square kilometres (134 sq mi) which includes the area of several small nearby islands.

Cedros Island is mountainous, reaching a maximum elevation of 1,205 metres (3,953 ft). The economy is based on commercial fishing and salt mining. Cedros has a distinctive flora and the traces of some of the earliest human beings in the New World. The ocean around the island is popular with sport fishermen.

There was human presence of the island already about 11,000 years ago. The American Indian inhabitants when the island was first visited by Spanish explorers in the 16th century called it 'Huamalgua', the "Island of Fogs."

Cedros Island is located in Ensenada Municipality, off the west coast of the Mexican state of Baja California, from which it is separated by 100-kilometre-wide (62 mi) Sebastián Vizcaíno Bay.

It also lies 15 km (9.32 mi) north of Isla Natividad (off Punta Eugenia, and also part of Mulegé Municipality) from which it is separated by the Canal de Keller, and some 500 km (311 mi) from San Diego.

The island has an area of 348.295 square kilometres (134.477 sq mi), being the fourth-largest island in Mexico. Between Cedros Island and Isla Natividad runs the 28th parallel north, which defines the border between the Mexican states of Baja California and Baja California Sur.

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