Cottesloe Beach to Rottnest Island - 19.7km!
Every year on the last Saturday in February sees nearly 3,000 swimmers attempt to cross the 19.7km stretch of water between Cottesloe Beach and Thomson's Bay. You can do it solo, with a mate (typically swapping every 5-10 minutes or so), or with three friends (like a relay, typically swapping every 30 seconds …
