Keep River

Keep
River
Name origin: Henry Francis Keep
Country	Australia
Territory	Northern Territory Western Australia
Region	Victoria Bonaparte (IBRA)
Tributaries
- left	Moriarty Creek, Dingo Creek, Knox Creek, Oakes Creek
- right	Alligator Creek, Chinaman Creek, Flying Fox Creek
Source
- elevation	132 m (433 ft)
Mouth
- elevation	0 m (0 ft)
- coordinates	15°08′45″S 129°12′9″E / 15.14583°S 129.20250°E / -15.14583; 129.20250Coordinates: 15°08′45″S 129°12′9″E / 15.14583°S 129.20250°E / -15.14583; 129.20250
Length	258 km (160 mi)
Discharge
- average	15.8 m3/s (558 cu ft/s)
Location of the Keep River mouth in the Northern Territory

The Keep River is a river, located in the Victoria Bonaparte bioregion of Western Australia and the Northern Territory in Australia.

The river rises just south of the Newry Station homestead then flows in a northerly direction crossing the Victoria Highway and then flowing through the Keep River National Park and veering westward across the border into Western Australia then veering east back into the Northern Territory. It then continues north before discharging into the Joseph Bonaparte Gulf and the Timor Sea.

The river catchment occupies an area of 6,003 square kilometres (2,318 sq mi) and is wedged between the Ord River catchment to the west and the Victoria River catchment to the east. The river has a mean annual outflow of 500 gigalitres (654,000,000 cu yd),

Important wetlands are found in the lower reaches of the river with forming suitable habitat for waterfowl breeding colonies and roosting sites for migratory shorebirds. Large areas of rice-grass floodplain grasslands are also found along the river.

The estuary formed at the river mouth is in near pristine condition. The estuary occupies an area of 230 square kilometres (89 sq mi) of open water. It is tide dominated in nature with a tide dominated delta having multiple channels and is surrounded by an area of 55.5 square kilometres (21 sq mi) covered with mangroves.

Riparian vegetation found along the margins in the river include Melaleuca, Barringtonia acutangula, Nauclea orientalis, reeds and taro are common in the upper reaches. In pools along the river sponges such as Spongillidae can be found on rocks. Toward the national park area aquatic vegetation such as species of Nymphea, Hydrilla verticillata and species of Chara become more frequent forming dense mats in some areas. Riparian vegetation includes Melaleuca, Barringtonia acutangula, Nauclea orientalis, Lysiphyllum cunninghamii and Pandanus spiralis.