Cape Howe Marine National Park (4,060 ha) is the fourth largest Marine National Park in Victoria and is located on the eastern border of New South Wales near Gabo Island. 

The marine animals and plants in the park reflect its location and include many species associated with both the warmer waters of the East Australian Current as well as as cooler waters from the west.  As such there are a number of species of fish including sharks and rays that are not often seen in other parts of Victoria.  

Cape Howe Marine National Park contains extensive shallow and deep subtidal reefs  interspersed by large areas of soft sediments and beds of shells. The park is alive with a variety of fish, with an assortment of warm and cool water species like Eastern Blue Groper, Purple Wrasse, Blue-Throated Wrasse, and Herring Cale. Kelp forests that form a major habitat for reef species were once extensive in the park but in recent years have been heavily impacted by overabundant native Black-spined Sea Urchins that have increased in numbers due to a warming and strengthening East Australian Current. 

Southern Right Whales and Humpback Whales regularly occur in the park with hundreds of humpbacks passing through the park on their migration between the tropics and Antarctic waters, sometimes followed by pods of Killer Whales.  Little Penguins are common too, foraging from the rookery at Gabo Island. Both Australian and New Zealand Fur Seals are found within the park. In 2021 an critically endangered Grey Nurse Shark was observed in the park during monitoring programs. 

Bordering the park is Croajingolong National Park with sand dunes formed from ancient pink granite and purple sandstones which outcrop near Cape Howe. There is also a small intermittent estuary, the outflow from Lake Wau Wauka, running directly into the park.