 The Seine, Thames, Meuse, Scheldt and Rhine rivers joined and flowed west along the English Channel as a wide slow river before eventually reaching the Atlantic Ocean.At about 10,000 BC the north-facing coastal area of Doggerland had a coastline of lagoons, saltmarshes, mudflats and beaches as well as inland streams, rivers, marshes and lakes.It may have been the richest hunting, fowling and fishing ground in Europe in the Mesolithic period.