Subterranean rivers of London
The subterranean or underground rivers of London are or were the direct or indirect tributaries of the upper estuary of the Thames that were built over during the growth of the metropolis of London. They now flow through culverts, with some of them integral parts of London's sewerage system and diverted accordingly.
The position of a mouth of the Effra in the 13th century.
The culverted mouth of the Earl's Sluice at Deptford Wharf
The Moselle on the surface flows through Tottenham Cemetery on its way to the Lea.
A subterranean river is a river or watercourse that runs wholly or partly beneath the ground, one where the riverbed does not represent the surface of the Earth. It is distinct from an aquifer, which may flow like a river but is contained within a permeable layer of rock or other unconsolidated materials. A river flowing below ground level in an open gorge is not classed as subterranean.
A subterranean river in the Cross Cave system of Slovenia. (Scale shown by people in photograph.)
The cave of source of the Buna can be entered by boat and dived through a cave system serving as an effluence of the Zalomka.
The Puerto Princesa cave can be entered by boat.
Devil's Throat Cave subterranean river from above
