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Then quite suddenly, the nettles are replaced by grasses, mud and then water. The transition to water is quite abrupt. The ground is relatively dry to the right of this picture. But where Ze is standing, its about 15 cm deep. As far as we can tell, its continuous water from here on to the end of the Colne at the River Thames in Staines, making this point the modern source. Upstream, the dry river bed continues for about 2 km, ending in ponds near to the little hamlet of Waterend (appropriately enough).