The Cordillera de Guanacaste, also called Guanacaste Cordillera, are a volcanic mountain range in northern Costa Rica near the border with Nicaragua. The mountain range stretches 110 km from northwest to the southeast and contains mostly complex stratovolcanoes. The range forms part of the southern region of the Continental Divide, with the highest …The Cordillera de Guanacaste, also called Guanacaste Cordillera, are a volcanic mountain range in northern Costa Rica near the border with Nicaragua. The mountain range stretches 110 km from northwest to the southeast and contains mostly complex stratovolcanoes. The range forms part of the southern region of the Continental Divide, with the highest peak is the stratovolcano Miravalles at 2,028 m.