"The second largest canyon in the world"

http://uwepetercom.blogspot.com/2001/10/the-second-largest-canyon-in-world.html
Fish River Canyon | Namibia | 2001-10
The Fish River Canyon is located in the south of Namibia. It is the second largest canyon in the world and the largest 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 metres deep.The Fish River is the longest interior river in Namibia.