Costa Rica | History, Map, Flag, Climate, Population, & Facts

Land

Extending from northwest to southeast, Costa Rica is bounded by Nicaragua to the north, by the Caribbean Sea along the 185-mile (300-km) northeastern coastline, by Panama to the southeast, and by the Pacific Ocean along the 630-mile (1,015-km) southwestern coastline. At the country’s narrowest point, the distance between the Pacific and the Caribbean is only about 75 miles (120 km).

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Relief

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Two mountain chains together run almost the entire length of Costa Rica. These are, in the north, the Cordillera Volcánica, noted for its volcanic activity, as the name implies, and, in the south, the Cordillera de Talamanca. The Cordillera Volcánica may be divided into three ranges, from northwest to southeast: the Cordillera de Guanacaste, the Cordillera de Tilarán, and the Cordillera Central. Designated a UNESCO World Heritage site in 1983, the Cordillera de Talamanca is a massive granite batholith, quite different geologically from the volcanically active northern ranges. Costa Rica’s highest point, Mount Chirripó (12,530 feet [3,819 metres]), is in the Talamanca system. Two of the highest peaks in the Cordillera Volcánica, Irazú (11,260 feet [3,432 metres]) and Poás (8,871 feet [2,704 metres]), have paved roads reaching to the rims of their active craters. These volcanoes, overlooking the Valle Central, pose a serious natural hazard, as do earthquakes for most of the country. Arenal Volcano (5,358 feet [1,633 metres]), about 56 miles (90 km) northwest of San José, is the country’s youngest stratovolcano. Its last major eruption, in 1968, destroyed two villages, and the volcano continued to spew lava and breccia into the early 21st century.

The Valle Central is separated into two parts by the continental divide. The eastern part is drained by the Reventazón River to the Caribbean, and the western sector forms part of the basin of the Grande de Tárcoles River, which flows into the Pacific. Another large structural valley, the Valle del General, lies at the base of the Cordillera de Talamanca in the southern part of the country. To the north and east of the mountainous central spine lie the Caribbean lowlands, constituting about one-fifth of the country and reaching less than 400 feet (120 metres) in elevation. The Pacific lowlands, which contain several small valleys and plains, include only about one-tenth of Costa Rica’s territory.

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Climate

Thermal convection and onshore breezes bring abundant rains to the Pacific coast in the wet season, generally May to October in the north and April to December in the south. Northeasterly trade winds on the Caribbean provide ample year-round precipitation for the country’s east coast, with the heaviest amounts occurring in the Barra del Colorado region. The higher mountain ranges have warm temperate climates, and the Pacific slopes have alternating wet and dry seasons.

Situated in the Valle Central at an elevation of 3,800 feet (1,160 metres), San José enjoys moderate temperatures and ample rainfall. Average monthly rainfall there ranges from well under 1 inch (25 mm) in February to more than 12 inches (300 mm) in September, with a yearly average of more than 70 inches (1,800 mm). Temperatures vary with elevation. San José has a mean temperature of 69 °F (21 °C), while means of 59 °F (15 °C) and 80 °F (27 °C) have been reported at stations located at 7,665 feet (2,340 metres) and 682 feet (210 metres), respectively.

Plant and animal life

Dense broad-leaved evergreen forest, which includes mahogany and tropical cedar trees, covers about one-third of Costa Rica’s landscape. On the Talamanca range grow numerous evergreen oaks and, above the timberline, mountain scrub and grasses. The northwest, with the longest dry season, contains open deciduous forest. Palm trees are common on the Caribbean coastline, and mangroves grow on the shallow protected shores of the Nicoya and Dulce gulfs along the Pacific. Mosses, orchids, and other tropical plants are abundant. Many of the world’s tropical biologists have carried out studies at the various research stations of the Organization for Tropical Studies, which has its headquarters in San Pedro, a suburb of San José, as well as at the Tropical Agricultural Research and Higher Education Centre (Centro Agronómico Tropical de Investigación y Enseñanza; CATIE) in Turrialba.

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Costa Rica’s numerous and varied life zones make the country attractive to biologists. Mammalian life is both abundant and varied and has major ties to South and North American populations. The South American species include monkeys, anteaters, and sloths, and the North American species include deer, wildcats, weasels, otters, coyotes, and foxes. There is a wide variety of tropical birds in the lowlands, and reptiles, such as snakes and iguanas, and frogs are common.