Qinghai is the largest province (excluding autonomous regions). Qinghai Lake is China's largest lagoon, is also the world's second-largest lagoon. Qinghai Lake is oval in shape, located 150 kilometers northwest of the Qinghai-Tibet Plateau. (93.21 miles) away from Xining. It reaches 28.71 meters. (77.79 feet) but average 19 meters (62.34 feet). It is 3,195 meters above sea level (10,482.28 feet) high and the surrounding climate is very cool. Even at noon during summer, the daytime average temperature is about 15 degrees Celsius (59 degrees Fahrenheit) and is often chosen as a summer resort.