The traverse of Cape Town's Table Mountain as an FKT route was laid out by Ryan Sandes, and is being tracked here:  https://www.redbull.com/za-en/events/ryan-sandes-fkt

Trail-Blazer Sandes sets Table Mountain FKT challenge

Wikipedia describes Fish River Canyon as follows:

"The Fish River Canyon (Afrikaans: Visrivier Canyon or Visrivier Afgronde, German: Fischfluss Canyon), is located in the south of Namibia. It is the largest canyon in Africa, as well as the second most visited tourist attraction in Namibia. It features a gigantic ravine, in total about 100 miles (160 km) long, up to 27 km wide and in places almost 550 meters deep."

This site has some details on the route and history.

This article from Red Bull describes the traverse and the Sandes, Gie & Reilly, and previous FKTs. Here's some of what it says: