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Completed in 1849, the original Wadjemup Lighthouse (also known as Rottnest Island Light Station) was Western Australia's first stone lighthouse〔(【引用サイトリンク】title=Rottnest Island Light Station (1896) )〕 and was built to provide a safer sailing passage for ships to Fremantle Port and the Swan River Colony. A second and larger replacement tower was built on the same site in 1896. It is the fourth oldest extant lighthouse in Western Australia and was Australia's first rotating beam lighthouse.〔〔 A shipwreck which was partly caused by poor communications and misunderstood signals from the lighthouse prompted the construction of another lighthouse on the island in 1900. ==Location selection and obelisk== Rottnest Island is the largest and northernmost of several islands near the Port of Fremantle. It is from the mouth of the Swan River and is generally the first land sighted by ships arriving from the west. The island is long, and at its widest point with a total land area of . The lighthouse site is at the highest point of the island at Wadjemup Hill, with the tower base above sea level. It is west of the Thomson Bay settlement and about south-west of the Geordie Bay settlement. Between 1837 and 1843, Commander John Clements Wickham led an expedition in with Lieutenant John Lort Stokes to chart sections of the Australian coastline. During the voyage Fremantle was visited seven times and in the course of one of these visits on 25 March 1840, Stokes wrote in his journal
In October 1840, Surveyor-General John Septimus Roe, together with Wickham and Stokes published ''Sailing Directions for the Navigation About Rottnest Island''. The document appeared in the ''Government Gazette'' and included
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