London Bridge, Natural arch in Port Campbell National Park, Victoria, Australia.

London Bridge is a limestone arch rising off the coast in Port Campbell National Park, Victoria. The structure now stands isolated in the ocean after its connection to the mainland broke away, displaying the typical weathering patterns of the Great Ocean Road.

The formation originally carried the name London Bridge because of its double arch structure that mimicked a bridge. In January 1990, the landward arch collapsed unexpectedly, transforming the connection into an isolated sea stack.

The rock formation sits within traditional Gunditjmara territory, whose people lived along this southern coast for thousands of years. Locals today associate the site with the dramatic story of the collapse that led to its renaming.

Visitors reach the viewing area via a sealed walkway that runs directly from the car park to the protected platforms. Wind off the ocean can be strong, so a jacket is advisable in any weather.

The landward span gave way on the evening of Monday 15 January 1990, not in the morning, stranding two tourists, Kelli Harrison and David Darrington, on the outer span until a police helicopter lifted them off. Nobody was hurt, and the collapse prompted comparisons with the nursery rhyme "London Bridge Is Falling Down".