Avebury & the Marlborough Downs

..The chalk ridge of Martinsell and St. Anne's Hill, not far from the centre of the county, furnishes three springs, which, as old Aubrey, the Wiltshire antiquary of the seventeenth century observed, 'do take their courses thence three several waies:' one to the German ocean through the Thames, one by Salisbury to the Channel, the third by Calne and Bristol into the Atlantic.