Hwajinpo Lake is the largest lagoon in Korea, created by a section of the ocean being closed off when two opposing sand spits merged. This unique formation and the ecosystem that came to live on the sand bar are highly valued. The water in the lagoon was a mix of fresh and salt water, creating a special environment for aquatic animals of both types to live together. The lake is in the shape of a figure eight, with the southern lake being larger than the northern lake, although the northern lake is still connected with the ocean through a small stream.