This is where the clear waters of Gunseong River flow into the sea. The sandy beach stretches 1 km in length and 50 m in width, with a gentle slope of 10–20 degrees. The sand is fine and the water is crystal clear. Its shallow depth makes it an ideal condition for a swimming beach. Nearby attractions include Deungmyeongnakgasa Temple, Deungmyeong Beach, Gyeongpodae Pavilion, Seongyojang House, Ojukheon House, and Jeongdongjin.

Anin Beach can be reached by following National Route 7 toward Donghae and Samcheok; the beach entrance will appear on the left. It is located about 12 km from Gangneung City Hall. Although the sand is fine, there are many rocks along the shore. Visitors can enjoy catching shellfish or fishing for species such as wrasse, flounder, black porgy, and rockfish. It is also a popular destination for summer vacationers.

Near Anin Beach is Aninjin Port, where visitors can enjoy sea fishing and skin scuba diving. To the south lies Unification Park, which features a Security Exhibition Hall and a Naval Vessel Exhibition Hall. There, visitors can explore the infiltration site of a North Korean submarine from 1996 and experience a security-themed hiking trail. Further south is Jeongdongjin. Close to Anin Beach is Haerangdang Shrine, where memorial rites were held for gisaeng (female entertainers). According to oral tradition, a magistrate of Gangneung once fell to his death while enjoying a swing ride with a gisaeng. Afterward, storms and poor fishing plagued the sea, prompting villagers to perform rituals. It is said that after the rites, the storms subsided and the fish returned in abundance.