A channel, cut into the ground or raised in a chute, to carry water (Latin aqua-) from a source, via zigzags and following a slightly sloping downward path (to keep it moving) to a point of dispersal, usually for drinking. The distance of aqueducts may vary substantially. These are common for Roman forts, e.g. Great Chesters, Northumberland and at Bowes, County Durham (which was reused in the Medieval period). Aqueducts need not have been lined with stones or wood.