Historical clue formulations

• Desert for which an African country is named — 2026-07-23
• Coastal African desert — 2024-08-26
• Desert in southern Africa — 2019-02-27
• Coastal desert of southern Africa — 2016-05-01
• African desert that includes the Skeleton Coast — 2015-12-12
• Southern African desert — 2015-01-04
• Oldest desert in the world — 2013-07-07
• Southwest Africa's ___ Desert — 2011-06-26