Crater Lake

UNITED STATES
The caldera lake in the state of Oregon in the United States is the main feature of Crater Lake National Park and famous for its deep blue color and water clarity. The deep caldera was formed around 5,677 BC by the collapse of the volcano Mount Mazama. Crater Lake is known for its famous piece of driftwood named the "Old Man of the Lake.", which is a full-sized tree that has been bobbing vertically in the lake for more than a century. Due to the cold water of the lake, the tree has been well preserved.