• Guanacaste, the common tropical American tree Enterolobium cyclocarpum

Costa Rica

• Guanacaste Province
  Guanacaste Province
  Guanacaste is a province of Costa Rica located in the northwestern part of the country, along the coast of the Pacific Ocean. To the north it borders Nicaragua. To the east is the Alajuela Province, and to the southeast is the Puntarenas Province. It is the most sparsely populated of all the...
  
  , a province of Costa Rica
• Guanacaste National Park (Costa Rica)
  Guanacaste National Park (Costa Rica)
  Guanacaste National Park, in Spanish , is part of the Area de Conservación Guanacaste World Heritage Site, is a National Park in the northern part of Costa Rica, from the slopes of the Orosí and Cacao volcanoes west to the Interamerican Highway where it is adjacent to the Santa Rosa National Park....
  
  , a small national park in Costa Rica
• Guanacaste Cordillera a mountain range in Costa Rica