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Archive for Rivers

The Kyzylsu River and Mountains of Southern Tajikistan

37.9N 69.7E

November 30th, 2009 Category: Rivers

Tajikistan - October 5th, 2009

Tajikistan - October 5th, 2009

Landlocked Tajikistan is the smallest nation in Central Asia by area. It is covered by mountains of the Pamir range, and more than fifty percent of the country is over 3,000 meters (approx. 10,000 ft) above sea level. This orthorectified image focuses on the mountains in the south near the city of Tulob (or Tulyab) and the border with Afghanistan.

Visible in the Kyzylsu Valley (left) is the Kyzylsu River, which rises on the southern slopes of the Vakhsh Range in the north-east of Tajikistan’s Khatlon Province and runs south-west for a length of 230 km until joining Panj River on the border with Afghanistan. Near Kulob it merges with the Yakhsu River as a major left tributary. The river irrigates the cotton-growing Kyzylsu Valley between Kulob and Panj in the south-east of Khatlon Province.

Pinacate Peaks Amidst Sand Dunes of the Gran Desierto de Altar, Mexico

31.7N 114.7W

November 30th, 2009 Category: Rivers, Volcanoes

Mexico - November 17th, 2009

Mexico - November 17th, 2009

The Colorado River pours thick tan sediments around Montague Island and into the Sea of Cortes. The sediments gradually take on a greenish appearance as they diffuse southward.

North of the rivermouth is the Gran Desierto de Altar, part of the Sonoran Desert. The desert’s vast sand dune field appears mostly tan here, with the exception of a dark brown circular area in the upper right quadrant.

This part of the desert is the location of the Pinacate Peaks, a group of volcanic peaks and cinder cones. The tallest of the peaks is Cerro del Pinacate (also called Volcan Santa Clara), elevation 3,904 feet (1,190 m).

Sobradinho Reservoir on the São Francisco River, Brazil

9.6S 41.5W

November 29th, 2009 Category: Lakes, Rivers

Brazil - November 15th, 2009

Brazil - November 15th, 2009

Sobradinho Lake is one of the largest artificial reservoirs in the world, with an area of 4,214 square kilometres (1,627 sq mi). It lies along the São Francisco River, in the Brazilian state of Bahia.

The Sobradinho Dam, built in 1977 and one of four hydroelectric plants along the course of the river, has storage capacity of 34.1 billion m3 of water.

The lower end of the reservoir appears tan in color, as it is filled with sediments where the São Francisco River spills into it. The color appears more greenish where the river exits after flowing through the dam.

Sediments Clouding Lake Erie, Canada and USA – November 28th, 2009

42.0N 81.3W

November 28th, 2009 Category: Image of the day, Lakes, Rivers

USA - November 8th, 2009

USA - November 8th, 2009

The waters of Lake Erie (below) are clouded by tan sediments, particularly along the upper shoreline to the left, while those of Lake Ontario (above) are much clearer with the exception of a small stretch along the southern shore.

Lake Erie is the fourth largest lake (by surface area) of the five Great Lakes in North America. It is the southernmost, shallowest, and smallest by volume of the Great Lakes, and therefore also has the shortest average water residence time. Lake Erie drains via the Niagara River and Niagara Falls into Lake Ontario.

It is bounded on the north by the Canadian province of Ontario, on the south by the U.S. states of Ohio, Pennsylvania, and New York, and on the west by the state of Michigan.

Dust Blowing Across Thar Desert in Pakistan

24.7N 68.0E

November 28th, 2009 Category: Dust Storms, Rivers

Pakistan - November 15th, 2009

Pakistan - November 15th, 2009

Dust blows over eastern Pakistan, blowing from the northeast towards the Arabian Sea. The dust is blowing across the Thar Desert, also known as the Great Indian Desert, a large, arid region in the northwestern part of the Indian subcontinent.

Visible west of the dust and Thar Desert is the Indus River and Valley. Continuing west of this fertile green area, the brown and tan grooves of the Balochistan Plateau can also be seen.

To the south, near the coast, the Rann of Kutch appears as a bright white area. It is a seasonally marshy saline clay desert located in the Thar Desert biogeographic province  by the Surendranagar District of northwestern India and the Sind province of Pakistan.  Below this area, tan sediments spill into the Gulf of Kutch and the Arabian Sea.