Its source is near the regional capital Opuwo, and the river flows through the Tonnesen and Giraffe Mountains into the Atlantic Ocean.

[1] The Hoarusib occasionally carries surface water during the rainy season from November to February/March.

The catchment area of the Hoarusib is 15,237 square kilometres (5,883 sq mi).

[2] The name Hoarusib is thought to have originated from the geology of this stretch as the Nama word "!naruseb" means "water which twists and turns through a narrow gorge.

"[3] It is known for its steep canyon walls of black and red volcanic rock, and the strange makalani palms which grows from the pips washed down from upstream.