Costa Rican Central Valley

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The Central Valley, or Valle Central, is a high, flat region in central Costa Rica. It is surrounded by mountains and volcanoes, especially to the north in the Central Range. The valley holds Costa Rica’s capital, San José, and most of the country’s people.

Four provinces share the area: Alajuela, Heredia, San José, and Cartago. The Central Valley covers about 11,366 square kilometers, a little over one-fifth of Costa Rica. The Tárcoles River drains the west side and the Reventazón River drains the east.

Geographically, it stretches from San Ramón in the west to Paraíso in the east. The northern mountains are part of the Central Range, and four main volcanoes lie to the north: Poás, Barva, Irazú, and Turrialba. To the south, the land is bordered by the Talamanca Range. A smaller ridge called the Carpintera Hills runs along the border of San José and Cartago and divides the valley into two parts: the Western Valley (Central Valley proper) and the Eastern Valley (Valle del Guarco).

Climate varies with altitude. Elevations range from 800 to 1,500 meters, so temperatures mostly fall between 18 and 30 degrees Celsius. The western part feels more Pacific-influenced, while the eastern part feels more Caribbean-influenced and can be more variable. Annual rainfall ranges from about 1,900 mm to 3,200 mm, and humidity is typically around 75–87%.

The Central Valley has long been Costa Rica’s population and farming center because its fertile land, rivers, and volcano soils support agriculture. Today it is the country’s economic hub for commerce, industry, and services, with ports on both coasts and with Liberia’s airport in Guanacaste as another international gateway. The Greater Metropolitan Area (GAM) is the main population center and covers roughly the same area as the Central Valley.