Samnak Ecological Park is a large ecological and sports park on the floodplain of the Nakdong River estuary in Samnak-dong, Busan. People walk the trails, ride bicycles, and do recreational sports while looking out over the Nakdong River. The park holds wide lawns where children run and separate areas where older adults exercise. When it rains, water does not drain and the rugby field and surrounding ground turn muddy.