Mandorah is a locality in the Northern Territory of Australia. Its local government area is the Wagait Shire. The locality of Mandorah on th…Mandorah is a locality in the Northern Territory of Australia. Its local government area is the Wagait Shire. The locality of Mandorah on the Cox Peninsula, across the harbour from Darwin, is named after "Mandorah", a guest house built in what is now the locality by Allan Hartwig prior to 1948.