Possible Clues:

• Bell tower
• What might ring old fortified site beside a river in Africa
• You get a build-up of a belly sound from this
• Bell-tower
• Belly sounds from there?
• Pitch your tent for a belly building over a river
• Impale can on a bell-tower
• Might this be said to be belly up there?
• Pitch your bell tent next to a river
• Pitch your tent beside a river in belly place, perhaps