Miravalles National Park, Protected nature reserve in Río Naranjo, Costa Rica

Miravalles Jorge Manuel Dengo National Park is a protected reserve with geothermal springs, volcanic rock formations, and thick forests across varied ecological zones. The land features numerous trails that pass through hot springs, steaming vents, and areas where the earth releases geothermal energy.

Miravalles Jorge Manuel Dengo National Park was created on 5 June 2019 by Executive Decree 41768-MINAE, which transferred 43 square kilometres from the surrounding Miravalles Protected Zone. It became Costa Rica's twenty-ninth national park. The Miravalles Volcano within it is still active; its last recorded eruption, in 1946, consisted only of steam vents.

The park is named after Jorge Manuel Dengo, the Costa Rican engineer who led the Instituto Costarricense de Electricidad and promoted the country's geothermal power. The geothermal plants near the volcano, run by the ICE, draw on the underground heated reservoir, and the Miravalles Solar Park stands on the same premises. Visitors can see this energy work beside the protected zone.

The park lies in the Guanacaste Province, within the Arenal Tempisque Conservation Area, and is reached via roads from Bagaces or Bijagua. The Miravalles geothermal plant and the adjacent Miravalles Solar Park, both operated by the Instituto Costarricense de Electricidad, stand near the protected zone. Trails are unmarked in places, so a local guide is useful; carry water and sun protection for the heat.

The geothermal plant beside the park is run by the Instituto Costarricense de Electricidad and draws on a large underground heated reservoir. On the same premises stands the Miravalles Solar Park, pairing geothermal and solar generation at one site. The park itself was carved out of the surrounding Miravalles Protected Zone in 2019.