The Discovery Bay Marine National Park is a protected marine national park located in the Western District of Victoria, Australia The 2,770-hectare (6,800-acre) marine park is located near Portland,[3][4][5] and extends along 6 kilometres (3.7 mi) of coastline on the western side of Cape Bridgewater, from Cape Duquesne to Blacks Beach, and offshore 3 nautical miles (5.6 km; 3.5 mi) to the limit of Victorian waters.

The Discovery Bay Coastal Park protects the adjacent coastline.

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