Fuxian Lake

Lore & Background

Fuxian Lake is recognized as part of an ecoregion together with other Yunnan lakes (Dian, Qilu, Yangzong, Xingyun, and Yilong). It is one of three major lakes in the province with a high number of endemic species, the others being Dian and Erhai. There are 24 native fish species and subspecies in the lake, including 11 endemics, all cyprinids or stone loaches. The extinction of endemic fish species, together with some native hydrophytes, accelerated in the first decade of the 21st century, threatened by introduced exotic fish, habitat degradation, water pollution, and overfishing. The fungus Dyrithiopsis lakefuxianensis, growing on submerged wood, has been collected from the lake and described as a newly discovered species. The prehistoric Fuxianhuia from the early-Cambrian, significant in discussions of early arthropod evolution, is named after the lake, where it was discovered in 1987.

Reader's Guide

Fuxian Lake's significance lies in its ecological uniqueness and archaeological mystery. As the deepest lake in Yunnan and the third-deepest in China, it hosts a high number of endemic fish species, but these are under severe threat from introduced species, pollution, and overfishing, with extinctions accelerating in the early 2000s. The lake is also the type locality for the fungus Dyrithiopsis lakefuxianensis and the namesake for the early-Cambrian arthropod Fuxianhuia, important for understanding arthropod evolution. In 2001, a submerged area of earthenware and stonework covering approximately 2.4–2.7 square kilometers was reported, speculated to have slid into the lake during an earthquake. Carbon dating in 2007 found shells attached to relics to be roughly 1,750 years old. A 2014 multidisciplinary team mapped portions and recovered 42 handmade stone artifacts from a depth of seven meters. The site's identification with a city called Yunyuan, proposed by archaeologist Zhang Zengqi, has been overturned by later analysis, leaving its origin uncertain.

Did You Know?

• Fuxian Lake is the second-deepest fresh water lake in China, after Kanas Lake.
• The lake has 24 native fish species and subspecies, including 11 endemics, all cyprinids or stone loaches.
• The prehistoric arthropod Fuxianhuia, discovered in 1987, is named after the lake.
• A submerged archaeological site covering 2.4–2.7 square kilometers was discovered in 2001, with carbon-dated shells from 2007 indicating an age of roughly 1,750 years.

Geography & Physical Profile

Nestled across three counties—Chengjiang, Jiangchuan, and Huaning—in Yunnan Province, Fuxian Lake occupies a surface area of 212 square kilometers, making it the third-largest lake in the province behind Dian Lake and Erhai Lake. What truly sets it apart, however, is its extraordinary depth: at 155 meters, it is the deepest body of water in all of Yunnan and ranks as the third-deepest freshwater lake in China, trailing only Tianchi and Kanas Lake. The lake's climate follows a subtropical highland pattern classified as Cwb under the Köppen system, bringing warm, humid summers contrasted with mild, dry winters. This combination of vast surface area, remarkable depth, and temperate seasonal rhythm creates a distinctive aquatic environment that has shaped both the region's ecology and its scientific importance for well over a century.

Ecology & Endemic Biodiversity

Fuxian Lake harbors a remarkably isolated aquatic community. Together with five other Yunnan lakes—Dian, Qilu, Yangzong, Xingyun, and Yilong—it forms a recognized ecoregion, and it stands as one of only three major lakes in the province boasting a high concentration of endemic species, alongside Dianchi and Erhai. The lake is home to 24 native fish species and subspecies, of which 11 are endemics, all belonging to the cyprinid family or the stone loach group. Yet this very isolation that fostered unique evolution now leaves the ecosystem fragile. The introduction of 26 exotic fish species, combined with habitat degradation, water pollution, and overfishing, has pushed most native populations into precarious territory. Tragically, the loss of endemic fish and native hydrophytes accelerated sharply during the first decade of the 21st century, underscoring how quickly a long-evolved community can unravel when external pressures mount.

The Submerged Ruins Mystery

In 2001, People's Daily reported the discovery of earthenware and stonework spanning roughly 2.4 to 2.7 square kilometers beneath the lake's surface, sparking widespread speculation that an ancient settlement had slid into the water during a seismic event. Yunnan Museum archaeologist Zhang Zengqi proposed a connection to a historical city called Yunyuan that once stood on the lakeshore, though later analysis dismantled that theory. The mystery drew further attention in 2006 when China Central Television conducted an additional survey of the site. Carbon dating results published in 2007 revealed that shells attached to recovered relics were approximately 1,750 years old, anchoring the remains in the late ancient period. In October 2014, a multidisciplinary research team returned to the site, mapping portions of the submerged area and recovering 42 handmade stone artifacts from a depth of seven meters—tangible evidence that human hands once shaped those stones before the lake claimed them.

A Crossroads of Scientific Discovery

Fuxian Lake has served as an unexpected wellspring for scientific breakthroughs across multiple disciplines. On its shore stands the one-meter vacuum solar telescope operated by the Yunnan Astronomical Observatory, a facility that harnesses the lake's high-altitude, relatively clear-sky conditions to study the Sun. In paleontology, the lake's name is forever linked to Fuxianhuia, an early-Cambrian organism discovered in 1987 that has become a significant reference point in debates over the early evolution of arthropods. Even in mycology, the lake has left its mark: the fungus Dyrithiopsis lakefuxianensis, found growing on submerged wood in the water, was described as a newly discovered species, its very name a testament to the lake as its type locality. From stellar physics to Cambrian zoology to fungal taxonomy, Fuxian Lake continues to yield findings that extend far beyond its shores.