AquaFonte lists 3 verified thermal springs in Costa Rica, each with its own page: temperature, minerals, treatments, and directions.
Water types found
Springs
Blue River Resort & Hot Springs
Upala, Alajuela · 54.8°C
A geothermal resort on the remote, seldom-visited northern flank of Rincón de la Vieja volcano, where three natural hot spring pools meet a blue mineral river inside 700 species of tropical garden.
Río Negro Hot Springs
Rincón de la Vieja, Guanacaste · 42°C
Volcanic hot springs and mud pools in the jungle foothills of Rincón de la Vieja — Costa Rica's most active volcano — where geothermal water heated deep beneath the Guanacaste mountains reaches the surface in a tropical forest setting.
Tabacón Hot Springs
La Fortuna, Alajuela · 39°C
Lush volcanic hot springs flowing through tropical rainforest at the foot of Arenal Volcano — one of Central America's most spectacular thermal settings.