Costa Rica is bordered to the north by Nicaragua and to the east by Panama. It has both a Caribbean and a Pacific coast. A series of volcanic mountain chains runs from the Nicaraguan border in the northwest to the Panamanian border in the southeast, splitting the country in two. In the center of these ranges is a high-altitude plain, with coastal lowlands on either side. Over half the population lives on this plain, which has fertile volcanic soils. The Caribbean coast is 212km (131mi) long and is characterized by mangroves, swamps and sandy beaches. The Pacific coast is much more rugged and rocky, and, thanks to a number of gulfs and peninsulas, is a tortuous 1016km (630mi) long.

The country's biodiversity attracts nature lovers from all over the world. The primary attraction for many visitors is the 850 recorded bird species, which include the resplendent quetzal, indigo-capped hummingbirds, macaws and toucans. Costa Rica's tropical forests have over 1400 tree species and provide a variety of habitats for the country's fauna including four types of monkey, sloths, armadillos, jaguars and tapirs. There are also a number of dazzling butterflies. National parks cover almost 12% of the country, and forest reserves and Indian reservations boost the protected land area to 27%.

Costa Rica is a tropical country and experiences only two seasons: wet and dry. The dry season is generally between late December and April, and the wet season lasts the rest of the year. The Caribbean coast tends to be wet all year. Temperatures vary little between seasons; the main influence on temperature is altitude. San José at 1150m (3772ft) has a climate that the locals refer to as 'Eternal Spring': lows average 15°C (60°F); highs average 26°C (79°F). The coasts are much hotter, with the Caribbean averaging 21°C (70°F) at night and over 30°C (86°F) during the day; the Pacific is a few degrees warmer still. The humidity at low altitudes can be oppressive.

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