Lake Chelan in the northeastern Cascades is featured in this south-looking, low-oblique, infrared photograph. Lake Chelan is the third deepest lake in the United States [1486 feet (453 meters)]—only Crater Lake and Lake Tahoe are deeper. Carved by ice-age glaciers that dammed the basin that holds it, Lake Chelan is 55 miles (88 kilometers) long and approximately 1 to 2 miles (1 to 3 kilometers) wide. Its northern end is part of Lake Chelan National Recreational Area, and national forest lands extend over almost the entire length of the lake (Okanogan National Forest to its north, and Wenatchee National Forest to its south). Agricultural field patterns and the Columbia River are visible in the upper-left portion of the photograph.