Poeppel Corner is where the borders of the Northern Territory, South Australia and Queenslandmeet.

Darwin is the capital City of the Northern Territory, Australia. The Northern Territory is actually a territory rather than a state.

Lake Amadeus 1.993 km'2

Because, Its in the Northern territory Border

The Northern Territory is a territory, not a state, in Australia. Positioned in the central northern area, it is bordered by Western Australia to the west, Queensland to the east, and South Australia to the south.