Guanacaste is a province of Costa Rica located in the northwestern region of the country, along the coast of the Pacific Ocean. It is bordered by Nicaragua to the north, Alajuela Province to the east, and Puntarenas Province to the southeast. It is the most sparsely populated of all the provinces of Costa Rica. The province covers an area of 10,141 square kilometres (3,915 sq mi) and as of 2010, had a population of 354,154, with annual revenue of $2 billion.

Costa Rica, officially the Republic of Costa Rica, is a country in the Central American region of North America. Costa Rica is bordered by Nicaragua to the north, the Caribbean Sea to the northeast, Panama to the southeast, and the Pacific Ocean to the southwest, as well as maritime border with Ecuador to the south of Cocos Island. It has a population of around five million in a land area of 51,060 km2 (19,710 sq mi). An estimated 333,980 people live in the capital and largest city, San José, with around two million people in the surrounding metropolitan area.