The Mary River in the Northern Territory offers a quintessential Top End paddling experience through vast, wildlife-rich wetlands. The primary character is one of a slow-moving, interconnected system of waterways, including the main river channel, lagoons, canals, and billabongs, set within the expansive Mary River National Park. The landscape is dominated by lush paperbark forests and monsoon vine thickets, creating a rich habitat. Paddling here is defined by the presence of a high density of saltwater crocodiles, which are a constant and significant hazard; they are regularly seen, including the famous "jumping crocodiles" on the nearby Adelaide River. This makes extreme caution and adherence to all safety warnings regarding crocodiles an absolute necessity for any water-based activity.

Access points for launching boats and, by extension, paddlecraft, are available at several locations. These include the Mary River Crossing boat ramp off the Arnhem Highway, which offers all-season access, as well as North Rockhole and Shady Camp, both of which have boat ramps and are popular fishing spots. Shady Camp also features a viewing platform for observing crocodiles upstream. The river is located about 110 to 150 kilometres east of Darwin, making it a feasible day trip or a stop en route to Kakadu National Park. The best time for visiting is during the dry season, when birdlife is concentrated at remaining water sources like Fogg Dam Conservation Reserve, where over 250 species can be observed. The wetlands are renowned for world-class barramundi fishing, with fish reaching sizes up to 1.4 meters, which attracts anglers globally. Key sights while on the water include abundant birdlife such as jabiru, brolga, sea eagles, and magpie geese, as well as monitors, wallabies, and introduced water buffalo. The water body's aesthetic is one of a thriving, complex ecosystem; the view from Couzens Lookout is noted for stunning sunsets. Facilities for visitors vary by site but can include picnic areas, toilets, and camping areas where fees apply, such as at Shady Camp and Couzens Lookout. The Mary River is one of eight major Top End rivers with large floodplains, and the Arnhem Highway crosses several of them. The river flows both north and south of this highway through its catchment area.