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Jagged Contours of Lake Volta, Ghana

7.1N 0.1E

June 19th, 2012 Category: Lakes

Ghana - January 3rd, 2012

This orthorectified wide-swath ASAR image shows the jagged contours of Lake Volta, the largest reservoir by surface area in the world, and the fourth largest one by water volume. It is located completely within the country of Ghana, and it has a surface area of about 8,502 km² (3,275 square miles). Lake Volta lies along the Greenwich Meridian, and just six degrees of latitude north of the Equator. The lake’s northmost point is close to the town of Yapei, and its southmost extreme is at the Akosombo Dam, 520 kilometers downstream from Yapei. The Akosombo Dam holds back both the White Volta River and the Black Volta River, which formerly converged, where the middle of the reservoir now lies, to form the single Volta River. The present Volta River flows from the outlets of the dam’s powerhouse and spillways to the Atlantic Ocean in southmost Ghana.

Lakes Victoria, Kyoga and Albert in Uganda

0.3N 32.5E

February 29th, 2012 Category: Lakes

Uganda- January 4th, 2012

This orthorectified wide-swath ASAR image shows several lakes in Uganda: Lake Victoria (bottom), Lake Kyoga (above center) and Lake Albert (upper left corner). The city of Kampala, the capital of Uganda and the largest city in the country, can be seen as a white area by the northern shores of Lake Victoria.

Lake Victoria is an African Great Lake and the largest lake on the continent by surface area, at 68,800 square kilometres (26,600 sq mi). It is the second largest freshwater lake by surface area in the world. Lake Kyoga is a large shallow lake complex of Uganda, about 1,720 km2 (660 sq mi) in area and at an elevation of 914 m. The Victoria Nile flows through the lake on its way from Lake Victoria to Lake Albert. Lake Albert is another one of the African Great Lakes – the seventh-largest lake in Africa, at about 160 km (100 mi) long and 30 km (19 mi) wide, with a maximum depth of 51 m (168 ft).

Payun Matru Shield Volcano and Llancanelo Lagoon, Argentina

36.4S 69.1W

February 3rd, 2012 Category: Lakes, Volcanoes

Argentina - January 9th, 2011

This orthorectified image shows Payun Matru (near the image center), a shield volcano in Argentina, located in the Reserva Provincial La Payunia of the Malargüe Department, to the south of Mendoza Province. Volcán Payun is notable for large crystals of hematite pseudomorphs after magnetite, of volcanic fumarole origin.

Visible as a large, black expanse to the north in the full image is Llancanelo Lagoon (Spanish: Laguna de Llancanelo, a wetland with an area of 650 km² located in the Malargüe Department in the south of Mendoza Province, Argentina. It is situated 75 km from the city of Malargüe, at 1,280 m above mean sea level, within the arid region near the Andes in the limit between the regions of Cuyo and Patagonia. Llancanelo Lagoon is a provincial nature reserve and a Ramsar site that hosts a variety of bird species.

Maipo Stratovolcano and Diamante Lagoon, Chile and Argentina

34.1S 69.8W

February 2nd, 2012 Category: Lakes, Volcanoes

Chile - January 9th, 2011

Visible at the center of this orthorectified image is Maipo, a stratovolcano in the Andes, lying on the border between Argentina and Chile. It is located 90 km south of Tupungato and about 100 km southeast of Santiago.

Maipo retains a symmetrical, conical volcanic shape, unlike many of the other nearby peaks, making it the best known peak in the region, though it is not the highest. (Nearby Castillo is 5,485 m high.) Maipo is also almost the southernmost 5,000 metre peak in the Andes. (That honor goes to Sosneado, about 50 km to the south).

Maipo is located within the Diamante Caldera, a feature of about 15 km by 20 km size that is about one-half million years old. It rises about 1,900 m (6,230 ft) above the floor of the caldera. Immediately to the east of the peak, on the eastern side of the caldera floor, is Laguna del Diamante, a picturesque lake that formed when lava flows blocked drainage channels from the caldera in 1826. The lake covers a surface area of about 14.1 km² and is one of the largest freshwater resources in the Province.

Sierra de Picachos and Falcon Lake, Texas, USA and Mexico

26.6N 99.2W

January 27th, 2012 Category: Lakes, Mountains

USA - January 5th, 2012

This orthorectified wide-swath ASAR image shows the Sierra de Picachos, in the state of Nuevo Léon, Mexico, appearing as an oval area of mountains near the left edge. The mountains cover a surface area of 1405 km². It ranges from 400 to 1200 meters above sea level.

Visible northeast of the range, near the right edge, is the Falcon International Reservoir, commonly called Falcon Lake. It is a reservoir on the Rio Grande 40 miles (64 km) southeast of Laredo, Texas, USA, and Nuevo Laredo, Tamaulipas, Mexico. The huge lake is bounded by Starr and Zapata counties on the Texas side of the international border and the municipality and city of Nueva Ciudad Guerrero on the Tamaulipas side of the border. The reservoir was formed by the construction of the Falcon Dam to provide water conservation, irrigation, flood control, and hydroelectricity to the area.