This photo should give an idea of the amount of volanic steam that bubbles up in some of the fumaroles in Rincon de la Vieja National Park. The steam results from underwater reserviors of water that become super heated due to the geothermal activity, and the water finds fissures to work its way up to the surface.
On the surface, there are pools of hot, muddy water that bubble and let off steam. The water can be grey and thick, but some mud pots are reddish. They usually have a sulfur smell.
Rincon de la Vieja is located just 25 km (15 miles) northeast of Liberia, which is the capital of the Guanacaste province. The addition of international flights into Liberia about 8 years ago is responsible for the enormous grown of tourism development along the Pacific resort areas such as Tamarindo.