Tenorio Volcano National Park (Spanish: Parque Nacional Volcán Tenorio) is located in the northern part of Costa Rica and is part of the Arenal Tempisque Conservation Area. The most famous feature of the park is the Tenorio Volcano, which gives the park its name. The volcano became part of the National Park in 1995 and is located about 26 miles (42 km) northeast of Fortuna in the Guanacaste Province.

The Rio Celeste looks blue because sulfur from the volcano mixes with calcium carbonate in the water. The area has thermal springs, small geysers, rivers, waterfalls, lagoons, and spots with great views. The upper part of the park has dense cloud forest, and the lower areas have rainforest. Tapirs and pumas live there, though pumas are rarely seen.

A ranger station at the volcano’s base gives visitors basic information. The Lago Las Dantas Trail leads to the summit, winding through forests to the top.

Next to the park is Tapir Valley Nature Reserve, a former cattle ranch turned into a natural habitat in 2004. A 20-acre (8-hectare) wetland in the reserve is the only place where the Tapir Valley tree frog (Tlalocohyla celeste) lives.