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Image of sand dunes in Rub' al Khali, Arabia's "empty quarter". Acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer, or ASTER, aboard NASA's Terra Earth-orbiting satellite.
False-color image of w:Teshekpuk Lake (left side of image) and the w:Alaska North Slope. Green indicates vegetation and blue indicates water. Some bodies of water also appear in off-white or yellowish, probably due to different amounts of sediment in the water and/or the sun angle. The Beaufort Sea is at the top of the scene. The image covers an area of 58.7 by 89.9 kilometers, and is centered near 70.4 degrees North latitude, 153 degrees West longitude.
The Strait of Gibraltar provides a natural physical barrier between the countries of Spain (north) and Morocco (south). In geologic terms, the 10-mile (16-kilometer) strait that separates the two countries, as well as Europe and Africa, is located where the two major tectonic plates—the Eurasian Plate and the African Plate—collide. This high-oblique, northeast-looking photograph shows the mountainous northern coast of Morocco and the coastal mountains of southern Spain, including the dagger-shaped, snow-covered Sierra Nevada Mountains of southeastern Spain. The Guadalquivir River flows from east to west along the base of the Sierra Morena Mountains in southern Spain. The famous British city of Gibraltar is located on the wedge-shaped peninsula on the east side of the bay in the southernmost protrusion of Spain. The city of Ceuta is a Spanish enclave on the extreme northeastern coast of Morocco. Ceuta, a free port with a large harbor, has remained under Spanish control since 1580.