In 1837, "Beagle" went to survey the coast of Australia. Commander John Clements Wickham was in charge. They started with the western coast between the Swan River (modern Perth, Australia) and the Fitzroy River. They then surveyed both shores of the Bass Strait. In May 1839 they sailed north to survey the shores of the Arafura Sea opposite Timor. This voyage ended in 1843.