Rabbit-proof fence

The rabbit-proof fence in 2005

The State Barrier Fence, formerly known as the Rabbit-Proof Fence, the State Vermin Barrier Fence, and the Emu Fence, is a series of pest-exclusion fences originally constructed between 1902 and 1907 to keep rabbits and other agricultural pests from entering Western Australia from the east.

There are three fences in Western Australia: the original No. 1 Fence crosses the state from north to south, No. 2 Fence is smaller and further west, and No. 3 Fence is smaller still and runs east–west. The fences took six years to build. When completed, the rabbit-proof fence (including all three fences) stretched 3,256 kilometres (2,023 mi). The cost to build each kilometre of fence at the time was about $250 (equivalent to $42,000 in 2022).

When it was completed in 1907, the 1,833-kilometre (1,139 mi) No. 1 Fence was the longest unbroken fence in the world.