View of Crater Lake National Park, Oregon, USA, from a pullout on the West side. Wizard Island in the center. This is the smallest portion of the lake. The biggest part is on the other side of the Island. The lake is 6 miles long and 5 miles wide and almost 2,000 feet deep. It is an ancient volcano cauldron that sits on top of the Cascade mountain range. It is very accessible to visit, though. There is even wheelchair access.