Thames Estuary The new airport would be built on a man-made island in the estuary north of Minster-in-Sheppey There is also some discussion about the need for a Lower Thames Crossing in order to alleviate traffic congestion at Dartford. The Thames Estuary is the focal part of the 21st-century toponym, the "Thames Gateway", designated as one of the principal development areas in Southern England. The appellation Greater Thames Estuary applies to the coast and the low-lying lands bordering the estuary itself. These are characterised by the presence of mudflats, low-lying open beaches and salt marshes, namely the North Kent Marshes and the
River Sheppey River Sheppey The River Sheppey has its source in a group of springs west of the village of Doulting, near Shepton Mallet in Somerset, England. It flows through the wetlands to the north of the Polden Hills and ultimately joins the River Brue. From Doulting, the Sheppey flows south west to Charlton, where parts of its course have been culverted. The river has been diverted underground for much, though not all, of its passage through Shepton Mallet. It reappears at Darshill and then flows south west through Croscombe to Dinder where it flows through the grounds of Dinder House which