Related Clues:

• See 17-Across
• Green shade
• Longest river in the world
• Shade of blue
• Aswan's river
• African river
• Blue ___
• Shade of green
• Cairo's river
• World's longest river
• Pharaohs' river
• See 54-Across
• See 5-Down
• Christie's 'Death on the ___'
• Egypt's main water supply