The Thousand Island Lake (Qiandao Lake) in Zhejiang, China, is an artificial lake made up of 1,078 large islands and another few thousand smaller ones. At 573 sq km, the Thousand Island Lake is a well-known tourist spot developed with themed islands such as Snake Island, Lock Island (which houses the world’s biggest lock), and the Island to Remind You of Your Childhood. It is also known for its clear, and sometimes drinkable water. The lake is also a popular diving spot for scuba enthusiasts, because below the surface lies the remains of two magnificent ancient cities.
The ancient cities were forgotten until 2001, when a local tourism official explored the lake’s potential as a scuba diving spot. It was found out that the two cities were well-preserved even after being submerged for 40 years. To boost tourism in the area, a submarine was built in 2004 for the prospect of visiting the cities underwater. Plans are also being laid out to build an Archimedes bridge (suspended tunnel) so tourists can view the cities on foot.