"Construction of the Number 1 Rabbit Proof Fence began in 1901. It stretched 1834 kilometres from the south coast to the northwest coast, along a line north of Burracoppon, 230 kilometres east of Perth. Unfortunately by 1902 rabbits had already been found west of the fence line."
Via:
The Rabbit Proof Fence (Western Perspectives on a Nation, Library and Information Service of Western Australia)