Tommycut Creek is a renowned tidal estuary and coastal creek system located within the Mary River system in the Northern Territory's Top End, near the western boundary of Kakadu National Park. It flows into Chambers Bay within the Van Diemen Gulf and is a premier destination for targeting trophy barramundi, especially during the annual runoff period. The area features expansive mangrove-lined banks and is part of a dynamic coastal environment undergoing significant ecological change due to saltwater intrusion, which has transformed former paperbark forests into stands of dead trees and expanding mangroves.