The River Kennet and the Kennet and Avon Canal flow east through the centre of the town to reach the Thames at Reading, while the River Lambourn (beside which is the country's largest horse-training paddocks in the Valley of the Lambourn Downs) partly forms its northern boundary, ending in the town. A tributary that is smaller still, the River Enborne, forms the southern boundary (and also the county boundary with Hampshire). Adjoining the town's south-eastern border is Greenham Common and the famous Newbury Racecourse. Newbury is surrounded on three sides (north, west and south) by the North Wessex Downs Area of Outstanding Natural Beauty. The downland to the south rises steeply out of the river valley providing scenic views, including Watership Down (made famous by the novel of the same name), Beacon Hill, the southeast's highest point Walbury Hill, and Combe Gibbet.