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Lake Urmia
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Lake Urmia

August 6, 2014
Green and tan shades show the extent of the water in Lake Urmia (also Orumiyeh or Orumieh) in western Iran. The lake is highly saline and only a few tens of meters deep even at high water. The shoreline appears as a white margin of salt. The lake is one of the largest in the Middle East, measuring 130 kilometers (80 miles) from the northern shoreline to the vegetated delta.

Rivers that flow into the lake appear as narrow green lines, especially on the southeastern lake margin (image top right). These rivers form deltas marked by clusters of green agricultural fields; soft soils and the nearby water supply support farming in an otherwise dry region. The lake and its wetlands have been declared a UNESCO Biosphere Reserve.

The city of Urmia stands out as a distinct gray patch surrounded by fields. On the opposite shore, an extinct volcano appears as an oval shape. A causeway and bridge connect the shorelines at this point.

The lake has been experiencing a drastic loss of water and now holds only 5 percent of its known high-stage volume. The drying is vividly illustrated by the fact that the volcano used to be entirely surrounded by the lake. The drop in water levels is related to a long-term decrease in rainfall and the extraction of water for farming. The progressive drying of the lake since 1984 is shown in this sequence of still images.

Astronaut photograph ISS040-E-17264 was acquired on June 23, 2014, with a Nikon D3S digital camera using an 80 millimeter lens, and is provided by the ISS Crew Earth Observations Facility and the Earth Science and Remote Sensing Unit, Johnson Space Center. The image was taken by the Expedition 40 crew. It has been cropped and enhanced to improve contrast, and lens artifacts have been removed.

Caption by M. Justin Wilkinson, Jacobs at NASA-JSC.

Credit: NASA



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