{ "type": "FeatureCollection", "features": [ { "type": "Feature", "properties": {}, "geometry": { "type": "Point", "coordinates": [ 98.525391, 35.326379 ] } } ] }Lake Donggi Cona (also Donggei Cuona or Dongxi Co) is located 4,090 m above sea level at the Tibetan Plateau. It´s surface area is ca. 229 km². Geology and water chemistry The lake basin is a tectonic pull-apart structure situated at the highly active Kunlun fault. It is characterised by a 92 m deep graben structure in the deeper western part of the lake basin, and a more shallow eastern part which is filled up with fluvial sediments. During the last ice age, the lake level was 24 to 57 m lower than today, and the lake a closed system without outflow. With rising lake levels during the Holocene, an outflow developed ca. 4300 years ago, turning the lake into an open system. Since ca. 6800 years, the lake is an oligotrophic freshwater lake, with oxygen supply down to the lake bottom and a mean pH of 8.6. A higher primary productivity than at present and brackish conditions were inferred for the late glacial to mid Holocene period. Ecology The vegetation in the lake catchment consists mainly of alpine meadows dominated by Kobresia, Artemisia, and Poaceae. Dunes on the alluvial plains around the lake are characterised by occurance of Salix sp. Literature