A State Department boundary study from 1972 provides the following
about the final borders that existed around the Walvis Bay exclave of RSA:

"The alignment of the Walvis Bay part of the South AfricaSouth-West
Africa boundary is based on the report and map of Wrey's survey of
1885. The arbitration award of 1911 confirmed the demarcation from
pillars A through G, and the remainder of the boundary was not
contested at the time of or following the arbitration proceedings of
Senor Prida.

The Walvis Bay part of the boundary is demarcated as follows:

Pillar A, situated at Pelican Point;
Pillar B, 15 geographical [nautical, 6,080 ft.) miles, to the south of
the former, near the coast;
Pillar C, behind the mission station at Rooibank;
Pillars D, E, and F, between the preceding pillar and Ururas, marking
a line which separates the sand-hills from the left, or south, bank of
the River Kuisip;
Pillar G, on the opposite side of the same river, coinciding with the
extremity of the land asked by for Mssrs. Wilmer and Evenson in Ururas;
Pillar H, on the top of Rooikop, in the desert of Nariep;
Pillar J, on the top of the black rock called Nuberoff, situated on
the south bank of the River Swakop, at a distance of 10 miles
approximately from its mouth;
Pillars K, L, and M, following the general direction of the course of
the Swakop towards the sea; and
Pillar N, in Walfisch Bay, in front of the Resident's house"

Regards to all,

LN