Crater Lake National Park in southern Oregon is the fifth oldest national park in the United States and the only national park in Oregon. The park encompasses the caldera of Crater Lake, a remnant of a destroyed volcano, Mount Mazama, and the surrounding hills and forests.The lake is 1,949 feet (594 m) deep at its deepest point, which makes it the deepest lake in the United States, the second deepest in North America and the ninth deepest in the world. The lake’s water commonly has a striking blue hue, and the lake is re-filled entirely from direct precipitation in the form of snow and rain.