Well I could'nt understand the maps Rhiannon, it suddenly made me think of squiggly leylines of water, and as leylines are contentious I suppose watersheds and neolithic man are hardly compatible either.. perhaps we should concentrate on the Winterbournes snaking their way to Swallowhead and the Kennet, start small and get bigger ;) there's definitely a welsh river/sea route anyway, or how would they have got the bluestones down to Stonehenge.....