Mongsanpo Beach, part of Taeanhaean National Park, stretches 18 kilometers southwest of Seosan, 9 kilometers south of Taean and along the west coast of the Nammyeon Peninsula. Mongsanpo's white sand beach is around 3 kilometers long and has a 5 degree tilt. The water is 1~2 meters deep with an average temperature of 22 degrees Celsius.

The beach is surrounded by a dense forest of pine trees. The pine tree forest along the beach serves as a good auto-camping location to enjoy some fresh air and the natural beauty of the surroundings. During low tide, the muddy sediments deposited by the tide provide a place where people come to catch clams and mud crabs or as a field trip for children to learn the mudflat ecosystem.

A 1-kilometer drive in the western direction while passing through the spectacular pine tree tunnel brings visitors to Mongdaepogu Port where a number of fishing boats are docked. Near the port, there are a number of small seafood eateries to enjoy freshly sliced raw fish at reasonable prices.