In March 2009 I organised a trip to travel the length of the river Severn, from its source to its estuary. My aim was to collect mud samples and document the geography along route. The mineral content of the mud varies with each sample due to a convergence of geological, social and industrial histories. Using Google Earth we had been able to plan possible points of access to the river and more importantly its sediment. We traveled up from London, camping in Hafren forest that first night before trekking up to the source We disguised ourselves as geography students with quadrants and clipboards in hand we were able to collect, document and explore the river without much notice. No one questioned our motives until Oldbury-on-Severn, a place popular with local ceramicists looking to use found clay.