Related Clues:

• Material deposited by a river
• Fine sand in a riverbed
• Bed liner?
• River residue
• Mississippi mud
• Jamboree
• Mouth filler
• Delta buildup
• Buildup at a river's mouth
• Deposit for a dirty bank
• Delta sediment
• Flooding residue
• Muddy deposit
• Riverside deposit
• Fine river sediment