Related Clues:

• Setting for a classic Agatha Christie mystery
• Longest 42-Across
• Shade of green or blue
• Pale green colour also known as Nile green
• Blue or white flower
• Undulating line of the river
• Runner has zero-energy
• Nothing to the east of the river
• The Frenchman is trapped between two points on the river
• Coming from garden, I leave flowing water
• It flows out of line
• River duck with a pointed tail
• River and province on the borders of Louisville
• A duck seen on English river
• The longest river in the world