Qinghai Lake--on our Tibeto-Burman ancient migration route.from wiki.

Qinghai Lake lies about 100 kilometers (62 mi) west of Xining in a hollow of the Tibetan Plateau at 3,205 meters (10,515 ft) above sea level.[13] It lies between Haibei Tibetan Autonomous Prefecture and Hainan Tibetan Autonomous Prefecture in northeastern Qinghai in Northwest China. The lake has fluctuated in size, shrinking over much of the 20th century but increasing since 2004. It had a surface area of 4,317 square kilometers (1,667 sq mi), an average depth of 21 meters (69 ft), and a maximum depth of 25.5 m (84 ft) in 2008.[14]

https://en.wikipedia.org/wiki/Qinghai_Lake Twenty-three rivers and streams empty into Qinghai Lake, most of them seasonal. Five permanent streams provide 80% of the total influx.[15] The relatively low inflow and high evaporation rates have turned Qinghai saline and alkaline; the salt concentration is presently about 1.4% by weight (seawater has a salt concentration of about 3.5%), with a pH of 9.3.[16] It has increased in salinity and basicity since the early Holocene.[16]

At the tip of the peninsula on the western side of the lake are Cormorant Island and Egg Island, collectively known as the Bird Islands.

Qinghai Lake became isolated from the Yellow River about 150,000 years ago.[16] If the water level were to rise by approximately 50 meters (160 ft), the connection to the Yellow River would be reestablished via the low pass to the east.[citation needed]

18,000 years ago, just after the end of the Last Glacial Maximum, the lake level of Lake Qinghai was around 30 metres lower than today. Between 15,600 and 10,700 years ago, lake levels secularly increased to around 10 metres lower than the present lake level, after which they declined slightly until around 9,200 years ago, when they began to rise again. Around 5,900 years ago, lake levels reached a peak of a few metres higher than today, before declining again amidst a regional cooling and drying trend until 1,400 years ago, when they were less than 10 metres lower than average modern levels. They then began to rise once more until reaching their present level.[17] Climate