The unnamed lake, the largest artificial lake in Peking University campus, is located in the north-central part of the campus. The shape is u-shaped. There is a stone fish sculpture in Hunan, and there is an island in the middle of the lake, which is connected with the north bank by a bridge. There is a stone boat at the southern end of the central island of the lake. There are Bell Tower, Linhuxuan, Flower Bed and edgar snow on the lakeside, and Boya Tower on the east coast. It is one of the landmark landscapes of Peking University.

The unnamed lake was originally unknown. In 1930s, when Professor Qian Mu from yenching university was teaching in yenching university, he named it "The Unknown Lake".

Traffic information:

1. Take Metro Line 4 to the East Gate Station of Peking University and walk about 200 meters to the southeast gate.

2. Take bus No.307, 355, 365, 498, 549, 579, 60 1, 6 14, 68 1, 696, 697, 699, 7 17.

Historical evolution:

This lake used to be supplied with water by Wanquan River. The area around Weiming Lake belonged to Shuchun Garden in Qing Dynasty, and Qianlong gave it to his favorite small Shenyang. There are 64 towers, 357 verandahs, pavilions and thousands of houses here, which are extremely luxurious. After Shenyang was later raided, Shu Chunyuan changed hands several times.

In the Qing Dynasty, it was an artificial lake in Shuchunyuan, a small Shenyang garden affiliated to Yuanmingyuan. The stone boat was built according to the stone boat in the Summer Palace. Later, the superstructure was burned down, leaving only a stone base.

Domestic water project:

Wanquan River flows from south to north through Haidian Town, Peking University, Tsinghua and Dashiqiao, and flows into Qinghe via beijing-baotou railway, with a total length of 9.5 kilometers. The river is used to irrigate the surrounding green space on weekdays, and undertakes the urban sewage discharge task of 2 1 square kilometer basin in flood season. It is also the only water source of Yuanmingyuan Ruins Park.

With the increase of urban population, the scenery of Wanquan River is no longer there. The massive discharge of urban domestic sewage around Wanquan River makes it a stinking river. At the beginning of the pollution control project, the thickness of river silt has reached 0.5m to1.2m..

It is understood that the Wanquan River regulation project costs 72.8 million yuan, which is jointly funded by the Beijing Municipal Government and the Haidian District Government. The purpose is to make Wanquan River flowing through Peking University, Tsinghua, Yuanmingyuan and Zhongguancun High-tech Park clear, and make Fuhai in Yuanmingyuan and the unnamed lake in Peking University connected with it become a pool of clear water. The pollution control project started on April 1 and was completely completed.