From 1904 to 1908, more than 80 percent of Namibia’s Herero people and 50 percent of its Nama people were killed by German forces in a genocide carried out in concentration camps like the one on Shark Island. Shark Island is a lonely, desolate place, almost Martian in its barrenness and removal from the wider world. Hewn from rocks worn smooth by the Atlantic’s beating waves, the only protection from the brutal African sun afforded there is a smattering of palm trees. This tiny outcrop off the coast of Namibia has a history even more somber than its present geography — and the only testimonial is a small marble memorial shaped like a grave marker. Today, Shark Island has been hemmed into the mainland as a peninsula jutting out from nearby Lüderitz, in the extreme southwest of Namibia. But from 1904 to 1908, it was home to a brutal concentration camp, unofficially referred to as “Death Island.” Shark Island was a tragic last stop for many Herero and Namaqua (also called Nama) people, pu...