Leschenault Estuary is an estuarine lagoon that lies to the north of Bunbury, Western Australia. It had in the past met the Indian Ocean at the Leschenault Inlet, but that has been altered by harbour works for Bunbury, and the creation of The Cut north of the historical inlet location.
The estuary is approximately 13.5 km (8.4 mi) in length and has a maximum width of approximately 2.5 km (1.6 mi). The total area of the estuary is 25 km2 (9.7 sq mi) The lagoon is separated from the ocean by a thin peninsula of sand dunes called the Leschenault Peninsula.[1]