Rottnest Island | Uncover Bickley Battery on the Ngank Yira Bidi

Learn about the history built into the bedrock of Wadjemup / Rottnest Island

While known as an island getaway, Wadjemup / Rottnest Island also played an important role in Western Australia’s military history.

The 10 km one-way Ngank Yira Bidi allows hikers to explore the two batteries of naval guns that tell a different Wadjemup story. Traversing the southeast corner of the island, hikers roam around the coast from Thomson Bay to Porpoise Bay, then cut inland to finish at Oliver Hill.

It’s a thought-provoking mix of nature and history. Experience the stunning natural beauty of beaches and bays, while the wreck of Shark provides a sobering reminder of the island’s maritime history. Marvel at the diverse range of birdlife at Serpentine Lake that stand in stark contrast to the man-made naval gun batteries at Oliver Hill and Bickley Bay.

The first stop on the trail is Bickley Battery. Installed on the island in 1937, Bickley Battery formed part of Western Australia’s coastal defence program. Its original aim was to protect the crucial Fremantle Port from hostile ships. But despite these plans, the guns were never fired on an enemy vessel. And as the threat of international war passed, the guns were dismantled — but the battery itself remained.

Now it stands as an intriguing reminder of the part Wadjemup played in Australian military history. While the 6-inch naval guns have now been removed, hikers can explore the remnants where the guns once stood. But they’re not gone entirely; head into Kingstown Barracks to see one of the guns on display outside the complex.

Henrietta Rocks

Bickley Bay

Serpentine Lake

Bickley Battery

Oliver Hill Battery

Be on the lookout for

Bickley Battery

Jubilee Observation Post

The Beachcomber sculpture

Oliver Hill Battery

Where to start Ngank Yira Bidi

The Ngank Yira Bidi starts at the Visitor Centre, heading southeast along the Thomson Bay beachfront towards Kingstown Precinct. Hikers can explore the Bickley Battery, then follow the trail markers as you make the 10 km one-way route around the coast, turning inland and finishing at Oliver Hill.

It’s a long walk back, so instead, take the Captain Hussey historical train to get back to the main settlement.

Download the Trail Map

Wadjemup Bidi Fact Sheets - Ngank Yira Bidi

Bickley Battery

Frequently asked questions

Wear some sturdy hiking shoes, bring a hat and sunscreen, and be sure to bring at least two litres of water with you.

The Ngank Yira Bidi is suitable for most ages and fitnesses. However, it can be quite rough and steep in parts, so it’s best to have some hiking experience under your belt before you start this trail.

You can find toilets at Thomson Bay, the Army Jetty, Kingstown Precinct, and at the end, at Oliver Hill. Water is only available at Thomson Bay, so be sure to pack enough for the whole hike. There aren’t many bins along the trail though, and you’ll only find them at specific bus stops along the walk, so please take your rubbish and recycling with you.