Mercers Lake, the 'Daddy' waterbody of the area. I've seen Great Northern and Black-throated Diver, Red-necked, Black-necked and Slavonian Grebe, Scaup, Smew, Red-breasted Merganser, Common Scoter, Bewick's Swan, Iceland and Little Gull on here, not bad for inland Surrey Holmethorpe Sand Pits are situated close to Redhill and Merstham, nestling between the natural features of the North Downs and Nutfield Ridge plus the man-made M23 and railway link between London and Brighton. Fullers Earth and sand have been quarried from the area since Roman times, although birdwatchers have only been paying attention since the first flooding of pits took place from about 1960. Recently extraction has stopped, although there are applications to carry on doing so across Mercer's Farm. What has been left is a series of deep pits and floods (Mercer's Lake, Spynes Mere, Mercer's West, Watercolours 1 and 2 and The Moors) of varying sizes. These waterbodies are largely di...