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Nezahualcoyotl Lake on Grijalva River, Mexico – January 16th, 2012

17.1N 93.3W

January 16th, 2012 Category: Image of the day, Lakes, Rivers

Mexico - December 31st, 2011

This APM image shows Nezahualcoyotl Lake, an artificial lake created by the hydroelectric Malpaso Dam, on the Grijalva River. The Malpaso Dam (also known as Nezahualcoyotl and Raudales Malpaso) is an embankment dam near Tecpatán in Chiapas, Mexico.  It was the first major dam on the Grijalva River.

The Grijalva River, formerly known as Tabasco River, is a 480 km long river in southeastern Mexico. The river rises in Chiapas highlands and flows from Chiapas to the state of Tabasco through the Sumidero Canyon into the Bay of Campeche. The river’s drainage basin is 134,400 km² in size.

Tonlé Sap During Middle of Dry Season, Cambodia

12.9N 104.0E

January 14th, 2012 Category: Lakes

Cambodia - January 14th, 2012

This APM image shows the western part of the Tonlé Sap (loosely translated as “Great Lake”) and surrounding floodplain. The Tonlé Sap is the largest freshwater lake in South East Asia, and is part of a complex lake and river system.

The Tonlé Sap is unusual for two reasons: its flow changes direction twice a year, and the portion that forms the lake expands and shrinks dramatically with the seasons. From November to May, Cambodia’s dry season, the Tonlé Sap drains into the Mekong River at Phnom Penh. However, when the year’s heavy rains begin in June, the Tonlé Sap backs up to form an enormous lake. This image shows the lake towards the middle of the dry season.

Southern Reaches of Lake Winnipeg, Canada

53.2N 97.9W

January 10th, 2012 Category: Lakes

Canada - January 8th, 2012

This APM image shows the southern reaches of Lake Winnipeg, a large, 24,514-square-kilometre (9,465 sq mi) lake in central North America, in the province of Manitoba, Canada. Its southern tip is located about 55 kilometres (34 mi) north of the city of Winnipeg.

Lake Winnipeg is the sixth-largest freshwater lake in Canada, but it is relatively shallow (mean depth of 12 m (39 ft), excluding a narrow 36 m (118 ft) deep channel between the northern and southern basins. It is the eleventh-largest freshwater lake on Earth. The east side of the lake has pristine boreal forests and rivers that are being promoted as a potential United Nations World Heritage Park. The lake is elongated in shape and is 416 km (258 mi) from north to south, with remote sandy beaches and large limestone cliffs.

Lagoons and Rivers Near the Coast of Mexico in Campeche

17.9N 92.8W

January 5th, 2012 Category: Lakes, Rivers

Mexico - December 23rd, 2011

On the right side of this APM image is a system of lagoons (dark green) near the coast of Mexico. Visible on the left side of the image are various rivers, flowing towards the Gulf of Mexico. The lagoons are part of the deltaic plain of the Usumacinta River, in the state of Campeche.

The lagoons are separated from the Gulf of Mexico by an area of sandy dunes. The principal lagoons in the system are Atasta, Pom, Río Muerto and Palancares Lagoons. The two largest lagoon are Laguna Atasta (left) and Laguna Pom (right), which are connected by a narrow channel.

Lake Malawi and Capital City of Lilongwe, Malawi

13.9S 33.7E

November 15th, 2011 Category: Lakes

Malawi - November 8th, 2011

This APM image shows a small section of the shoreline of Lake Malawi (also known as Lake Nyasa in most countries), an African Great Lake, in Malawi. The shoreline appears mountainous, as Lake Malawi lies in the Great Rift Valley that was formed by the opening of the East African Rift, where the African tectonic plate is being split into two pieces. It is the southernmost lake in the Great Rift Valley system of East Africa.

Further south, upon opening the full image, the city of Lilongwe can be observed as a yellowish area near the center right edge. It is the capital and largest city of Malawi, with an estimated population of 902,388 as of 2009.

Lilongwe lies in the country’s central region, on the Lilongwe River, near the border of Malawi, Mozambique, and Zambia, and on the main north-south highway of Malawi. Lilongwe features a humid subtropical climate that borders on a subtropical highland climate, with pleasantly warm summers and mild “winters”. Due to the altitude, temperatures are lower than would be expected for a city located in the tropics.