100 Crater Park has several power plants to exploit geothermal heat to produce salt from sea water and to provide electricity for the national power grid (power plant on bottom right). The mud pools and steam vents on the southwest part of Reykjanes close to Reykjanes lighthouse are collectively named Gunnuhver after a legendary female troll that died there. She had caused great local disturbance until a priest set a trap for her, she fell into the boiling spring, and was cooked.