Historical clue formulations

• Egypt/Sudan border region — 2025-11-30
• Region of ancient Egypt — 2017-09-10
• Egypt/Sudan border region — 2015-11-04
• Nile Valley region — 2013-12-11
• Nile Valley region — 2010-03-25
• Ancient Egyptian kingdom — 2008-11-09
• Nile Valley region — 2008-10-22
• Northeast Sudan, once — 2000-06-15
• Ancient kingdom on the Nile — 1997-04-15
• Nile valley area — 1994-04-02
• Ancient Red Sea kingdom — 1994-01-09