What is the longest river in the Northern Territory

Victoria River
Flowing for 560 kilometres (350 mi) from its source, south of the Judbarra / Gregory National Park, until it enters Joseph Bonaparte Gulf in the Timor Sea, the Victoria River is the longest singularly named permanent river in the Northern Territory.

Part of the area adjoining the river mouth has been identified as the Legune (Joseph Bonaparte Bay) Important Bird Area because of its importance for waterbirds. However, the longest permanent river in the Northern Territory, as defined by international standards, is the Katherine/Daly River.

This is a single river with two separating (at the Flora River tributary) European names.

This great river was, until recently, deemed as two separate rivers due to the European naming conventions of the time.

Its journey begins just south of Jabiru, high in the Arnhem Land escarpment as a trickle until it flows into the Timor Sea some 690 kilometres (430 mi) later, thus making it 130 kilometres (81 mi) longer than the Victoria River.

Read more...https://en.wikipedia.org/wiki/Victoria_River_(Northern_Territory)