Lake Arenal is a man-made lake that sits at the base of the Arenal Volcano in the northern highlands of Costa Rica. It is the country’s largest landlocked body of water, with a surface that covers nearly 33 square miles (85 square km) and a depth that reaches some 200 feet (60 m).

Driving around the lake you go from the sunny Pacific part of the country to the rainforest, and the skies get greyer and greyer.