Europeans mapped California as an island for a century
Mexico’s Baja California peninsula runs 1,247 kilometres from Mexicali to Cabo San Lucas, 40 to 320 kilometres wide, with roughly 3,000 kilometres of shore, about sixty-five islands, and 143,390 square kilometres of desert ranges separating the Pacific from the Gulf of California.
The name California entered European fantasy via Garci Rodríguez de Montalvo’s 1510 romance Las Sergas de Esplandián, an Amazon island near paradise. Early Spanish sailors thought Baja was that isle until Francisco de Ulloa proved the peninsula in 1539 and dubbed the gulf the Vermillion Sea—later Sea of Cortez or Gulf of California. Cortés’s 1532 ships vanished; a 1533 mutiny under Fortún Ximénez briefly planted La Paz before bloodshed.
Ortelius drew a peninsula in 1589, yet Antonio Ascensión’s circa-1620 island sketch, seized and recopied via Dutch and English printers, revived the myth through maps as late as about 1720. Jesuit Eusebio Kino’s overland observations and 1701–1707 map finally re-anchored California to the continent. Yuman-speaking peoples and neighbours such as Paipai, Kumeyaay, Cochimí, and Pericú met the missions that Jesuits, then Franciscans and Dominicans, planted before 1804’s Alta/Baja split.
Tectonically the peninsula tore from the North American Plate as the East Pacific Rise cut in some 12–15 million years ago; it now rides the Pacific Plate via the Gulf of California Rift Zone toward the San Andreas system. Peninsular Ranges—Jurassic–Cretaceous batholith kin to the Sierra Nevada—crest at Picacho del Diablo in the Sierra de San Pedro Mártir. Desert mangroves stash millennia-old peat carbon beneath rocky inlets.
Highway 1’s 1973 paving, statehood for Baja California (1952) and Baja California Sur (1974), and even William Walker’s 1853 filibuster all arrived long after the island delusion died.
Source: Baja California peninsula
