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."