The Lower Glenelg National Park is a national park in the Western District of Victoria, Australia. The 27,300-hectare (67,000-acre) national park is situated approximately 323 kilometres (201 mi) west of Melbourne. The major features of the park are the Glenelg River gorge and the Princess Margaret Rose Cave. Much of the route of the Great South West Walk is located within the national park. Land within the national park, the Discovery Bay Coastal Park and the was listed as a Ramsar site known as the Glenelg Estuary and Discovery Bay Ramsar Site on 28 February 2018.