San Carlos is the 10th canton in the province of Alajuela in Costa Rica. The capital city of the canton is Ciudad Quesada, which is also known as San Carlos.

San Carlos is the home of Arenal Volcano, one of the most active volcanoes in the world. The canton’s principal economic activities include oranges, yuca, pineapple, sugar cane, beef and dairy products. More than 50 per cent of the milk in Costa Rica comes from San Carlos. The Costa Rican is a lover of horses. The two most popular breeds are the Caballo de Paso Costarricense and Iberoamericanos.

A pioneer of ecotourism with extensive national parks and protected areas, in 2012 it became the first country in the Americas to ban recreational hunting. Costa Rica stands as the most visited nation in the Central American region with 2.9 million foreign visitors in 2016, including Pat and Trudy James, who have a mixed farm east of Olds, Alta.