Fayl:Ounianga Lakes from ISS.jpg

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English: Ounianga Sérir group. This astronaut photograph features one of the largest of a series of ten mostly fresh water lakes in the Ounianga Basin in the heart of the Sahara Desert of northeastern Chad. The lakes are remnants of a single large lake, probably tens of kilometers long, that once occupied this remote area approximately 14,800 to 5,500 years ago. As the climate dried out during the subsequent millennia, the lake shrank, and large, wind-driven sand dunes invaded the original depression, dividing it into several smaller basins.
The area shown in this image is approximately 11 by 9 kilometers. The lakes’ dark surfaces are almost completely segregated by linear, orange sand dunes that stream into the depression from the northeast. The almost-year-round northeast winds and cloudless skies make for very high evaporation rates; an evaporation rate of more than 6 meters per year has been measured in one of the nearby lakes. Despite this, only one of the ten lakes is saline.
Tarix Taken on 14 noyabr 2009, 13:04 UTC
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Müəllif NASA
Camera location    Kartographer map based on OpenStreetMap. View this and other nearby images on: info
This image or video was catalogued by Johnson Space Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: .

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Public domain
This file is in the public domain in the United States because it was created by the Image Science & Analysis Laboratory, of the NASA Johnson Space Center. NASA copyright policy states that "NASA material is not protected by copyright unless noted". ( or ). Photo source: .

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təsvir edir

yaranma tarixi

14 noyabr 2009

coordinates of the point of view ingilis

18°55'48.29"N, 20°52'15.35"E

heading ingilis: 0 dərəcə

captured with ingilis

Nikon D2Xs ingilis

exposure time ingilis

0,002 saniyə

f-number ingilis

5,6

focal length ingilis

800 millimetr

ISO speed ingilis

100

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hal-hazırkı 4.288 × 2.848 (3,88 MB) new rendered in high quality and native resolution from NASA's raw image data
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1.440 × 960 (316 KB) {{Information |Description={{en|1=This astronaut photograph features one of the largest of a series of ten mostly fresh water lakes in the Ounianga Basin in the heart of the Sahara Desert of northeastern Chad. The lakes are remnants of a single large lake

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