Limmen Bight is a bight, or large, open bay, located in the Northern Territory of Australia at the western end of the Gulf of Carpentaria about 360 kilometres east of the town of Katherine. It is part of the traditional lands and waters of the Marra people. It was named in April 1644 by Abel Tasman for one of his ships on his voyage of exploration along the northern Australian coast. It contains the second largest area of tidal flats in the Northern Territory.
Limmen Bight contains several small offshore islands, the largest of which is Maria Island; others are Edward, Sandy and Beatrice Islands, and Low Rock. It is bounded on the south-west by the Gulf Plains of the Northern Territory, on the north-west by the south-eastern coast of Arnhem Land, and in the north by Groote Eylandt. The mouth of the Roper River marks the westernmost point of the bight; other rivers flowing into the bight include the Rose, Towns and Limmen Bight Rivers. Land around the bight is predominantly Aboriginal freehold land held by the Arnhem Land and Marra Aboriginal Land Trusts, with some parts lying within the Nathan River and other pastoral leases. Port Roper, at the mouth of the Roper River, is a site for semi-permanent fishing camps.
