Managed by Hotel Hacienda Guachipelin, the Rio Negro Hot Springs are heated naturally by the Rincon de la Vieja Volcano, the largest and most active volcano in Guanacaste, Costa Rica. Surrounded by a thick forest, the crystal clear river flows through 10 humanmade pools created to capture the steaming mineral-rich water. Visitors can access the pools on both sides of the river via two hanging bridges. There are changing rooms, bathrooms and lockers at the hot springs entrance.