Marengo: Coast, Beacon and Marine Life

Discover Marengo through its coastal landscape, the history of the Marengo Beacon and the habitats in the Marengo Reefs Marine Sanctuary. Rocks from the Early Cretaceous are visible on the rocky coastal headland; the Sanctuary focuses on the reef, intertidal zone and marine life. When planning a stay, it helps to distinguish between these themes: rocks and the history of the Beacon shape one perspective, while natural areas and their conditions shape the other.

Rocks at Marengo Beacon

The Marengo Beacon stands on a small rocky coastal headland. Non-marine sedimentary rocks from the Early Cretaceous are visible there and date back 110 million years. They formed during the separation of Australia from Gondwana. Directly below the Beacon, alternating layers of mudstone, sandstone and siltstone reveal a prehistoric freshwater river landscape with a backwater area.

The age and geological context provide the broader time frame; the alternating rock layers also point to the landscape of the past. Both the dating and the sequence of different rock types are in focus at the Beacon.

The history of navigational aids

The Marengo Beacon was erected in 1858 as a navigational aid after two ships were wrecked in quick succession on Haley Reef, located 100 metres off Marengo. The four Marengo Beacons were completed less than two months after the Grange was wrecked.

More recent history also includes a change in navigational aids: in the summer of 2019–20, the Beacon was removed after new electronic reef markers made it redundant as a navigational aid. Following calls from residents for its restoration, the Council decided to create a replacement. The decision provided for using some of the original timber and adding a modified sphere on top. This was intended to ensure the replacement would not be mistaken for the original Beacon.

Marengo Reefs Marine Sanctuary: Reef and access

The Marengo Reefs Marine Sanctuary is less than 50 metres offshore. The inner reef can be reached by boat, by swimming or in small watercraft; at very low tide, it is possible to walk there from Hayley Point in Marengo. When conditions are suitable, access for snorkelling is also possible from Marengo Beach. Strong tidal currents occur in the Sanctuary area. Check local conditions before choosing any of these access options.

The intertidal zone is rich in species. The intertidal reef provides a habitat for marine snails such as abalone and periwinkles, as well as tube worms, barnacles and bryozoans. Bull kelp, large brown algae, red and green algae, sea squirts and sponges also grow in the Sanctuary. Algae are found in the subtidal zone, including beds of temperature-sensitive giant kelp (Macrocystis pyrifera). The larger island in the Sanctuary is a resting place for Australian fur seals, is designated a Special Protection Area and is closed to access.

Walking in Marengo Bush Reserve

Marengo Bush Reserve offers a five-kilometre circuit walk. This adds a distinct nature focus to the coast’s geological and maritime themes, with a clearly stated walking distance.

Discover more destinations: Puckapunyal, Ringwood, Wongarra, Yarrambat, Sutherland, Condah, Netherby, Sorrento

For the overview of the wider region: Victoria.