As we approached the start of our swim in the Tamar, our excitement grew. First, the magnificent sight of the river itself - the Rhine of Devon. Then, as we got down towards the bank, we had to troop through vast reed beds which towered over us as we walked. It felt like being in the Cambodian jungle. When we finally got into the water, after our very hot trek, it was bliss. We were swimming an Oxbow, which somehow felt like a very special thing to do. There's something about an oxbow: a sort of indulgent meandering off course into a beautiful bulge; its lazily serpentine shape, and a pleasing circularity about the way you end up practically where you started.