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Mount Sipan Stratovolcano North of Lake Van, Turkey – March 15th, 2010

38.6N 42.9E

March 15th, 2010 Category: Image of the day, Lakes, Volcanoes

Turkey - February 18th, 2010

Turkey - February 18th, 2010

Lake Van, the largest lake in Turkey, occupies most of this orthorectified image. It is a saline and soda lake, receiving water from numerous small streams that descend from the surrounding mountains. It is an endorheic lake (having no outlet), as the original outlet from the basin was blocked by an ancient volcanic eruption.

As a deep lake with no outlet, Lake Van has accumulated great amounts of sediment washed in from surrounding plains and valleys, and occasionally deposited as ash from eruptions of nearby volcanoes. This layer of sediment is estimated to be up to 400 metres (1,300 ft) thick in places, and has attracted climatologists and vulcanologists interested in drilling cores to examine the layered sediments.

One volcano visible near its shores is Mount Sipan (or Mount Süphan), a stratovolcano. Located immediately north of Lake Van, it is the second highest volcano in the Armenian Highlands, after Mount Ararat.

Mount Nemrut and Arms of Lake Van, Turkey – November 30th, 2009

38.6N 42.9E

November 30th, 2009 Category: Image of the day, Lakes, Volcanoes

Turkey - November 24th, 2009

Turkey - November 24th, 2009

Lake Van is one of the largest endorheic lakes in the world and the largest lake in Turkey, located in the far east of the country in the Van district. It is a saline and soda lake, receiving water from numerous small streams that descend from the surrounding mountains. Here, the Nemrut Volcano can also be seen west of the lake, partially covered with snow.

The lake’s average depth is 171 metres (560 ft) with a maximum recorded depth of 451 metres (1,480 ft). The western portion of the lake is deepest, with a large basin deeper than 400 m (1,300 ft) lying northeast of Tatvan and south of Ahlat. This deeper section of the lake appears navy blue here.

The eastern arms of the lake, on the other hand, are shallower and appear greenish from sediments and algae. The Van-Ahtamar portion, southeast, shelves gradually, with a maximum depth of about 250 m (820 ft) on its northwest side where it joins the rest of the lake. The Erciş arm, northeast, is much shallower, mostly less than 50 m (160 ft), with a maximum depth of about 150 m (490 ft).

Over 100 species of phytoplankton have been recorded in the lake including flagellates, diatoms, bacteria, cyanobacteria, green algae and brown algae. Thirty-six species of zooplankton have also been recorded including Rotatoria, Cladocera and Copepoda in the lake.

Nemrut Volcano Near Shores of Lake Van, Turkey – September 28th, 2009

37.9N 38.7E

September 28th, 2009 Category: Image of the day, Lakes, Volcanoes

Turkey - September 6th, 2009

Turkey - September 6th, 2009

Mount Nemrut, whose round caldera is easily identified near the center of this orthorectified image, is a dormant volcano in Eastern Turkey. It is near Tatvan, a small town in the eastern Anatolian province of Bitlis. The mountain rises from the southwestern shore of Lake Van (upper right), and enters the district of Ahlat to the north.

The volcano is 3,050 m (10,007 ft) high and its elliptic caldera has a diameter of about 7 km by 8 km (4 mi by 5 mi). The western part of the caldera contains a large coldwater crater lake about 155 m (509 ft) deep. There is also a small warm lake whose temperature reaches 60 °C (140 °F), providing evidence of continuing volcanic activity.

Mount Nemrut is the southernmost and youngest of the chain of volcanoes in eastern Anatolia. It is a stratovolcano that began erupting during the fourth geological era and continued to be active until 1597 A.D.

As a result of the volcanic eruptions of Mount Nemrut, the single Van-Mus River Basin was divided into two separate basins. The eruption of Nemrut volcano also led the formation of Lake Van, the largest lake in Turkey.

Dust Over Iraq and Colors of Lakes Van and Urmia – June 4th, 2012

37.1N 44.4E

June 4th, 2012 Category: Dust Storms, Image of the day, Lakes, Rivers

Iraq, Iran, Turkey - June 1st, 2012

This image focuses on two large bodies of water: Lake Van, in Turkey (upper left) and Lake Urmia, in Iran (right). Lake Van usually appears dark blue due to its depth, with some green from sediments and algal growth in its shallower sections. Lake Urmia, however, changes color frequently (click here for more images) as it is relatively shallow and subject to more fluctuations in salt/mineral content and algal growth.

A third large lake can be seen upon opening the full image: the teardrop-shaped Lake Tharthar, in Iraq. Dust can be seen blowing near the lake, over the valley through which the Tigris and Euphrates Rivers flow.

Caucasus Mountains and Lakes Van, Urmia and Sevan in Eurasia – August 25th, 2011

41.5N 44.8E

August 25th, 2011 Category: Image of the day, Lakes, Mountains

Caspian Sea - July 26th, 2011

The Caucasus Mountains stretch between the Black Sea (left) and the Caspian Sea (right) in the Caucasus region of Eurasia. The Caucasus Mountains include the Greater Caucasus Mountain Range and
the Lesser Caucasus Mountains.

The Greater Caucasus Range extends from the Caucasian Natural Reserve in the vicinity of Sochi on the northeastern shore of the Black Sea, generally trending east-southeast and reaching nearly to Baku on the Caspian Sea, while the Lesser Caucasus runs parallel to the greater range, at a distance averaging about 100 km (62 mi) south.

Visible to the south of the mountains are three lakes arranged in a triangle: Lake Van, in Turkey (left), the reddish Lake Urmia, in Iran (right), and Lake Sevan, in Armenia. Each is the largest lake in its respective country.