Fort Dundas was a short lived British settlement on Melville Island between 1824 and 1828 in what is now the Northern Territory of Australia. The establishment of the settlement caused the border of New South Wales to be moved west from the 135th meridian to the Western Australian border (129th meridian). The settlement of Fort Dundas was begun in September 1824, after HMS Tamar, HMS Lady Nelson, and Countess of Harcourt had set out from Sydney to colonise the northern part of Australia. Port Dundas was named for Robert Dundas, the First Lord of the Admiralty.