Tanjung Sirombu, lying about 34 miles SSE of Tanjung Sosilutte, is low and wooded and may be identified by several tall casuarina trees which stand above the other trees. The point is marked by a light. From a distance it resembles an island, but from closer in the low wooded sandy isthmus joining it to the land is visible.
From both N and S of the point, the broad flat-topped hill Sommumme, 587m high, about 12 miles NE, is visible.
The coast S of Tanjung Sirombu is high. The hilly land extends down the coast at nearly all points. In many places, especially off the projecting rugged headland, large black abovewater rocks lie close inshore.
The coast is indented for about 33 miles SE from Tanjung Sirombu to Tanjung Lauju, the SW extremity of Pulau Nias. Tanjung Lauju is low, but rises gradually to 110m.