Twin Falls, Waterfall on the South Alligator River in Kakadu National Park, Northern Territory, Australia

Twin Falls (Gungkurdul) is a cascade on the South Alligator River in Kakadu National Park, falling from 158 m above sea level in tiers 44 to 51 m high. It lies near the park's eastern boundary, 80 km south of Jabiru, and is reached by a four-wheel-drive track about 60 km from the Kakadu Highway, past Jim Jim Falls. A white sand beach sits at its base, with a narrow path up to the top.

The waterfall gained official recognition in 1980 when added to the Register of the National Estate. This protected the site as a place of natural and cultural value to Australia.

The falls are known as Gungkurdul in Kundjeyhmi, the language of the Bininj people on whose country they lie. Visitors reach the base by a small motorboat, since swimming in the gorge has been banned since 2003 because saltwater crocodiles swim up to the plunge pool in the wet season.

Getting to this waterfall requires a high-clearance vehicle to handle the rough track and creek crossings. It helps to go early in the day and come prepared for remote conditions.

A boat carries visitors across the gorge to reach the base of the falls safely. This transport exists because swimming is not permitted in these waters due to crocodile presence.