Pitstone Quarry straddles the Buckinghamshire and Hertfordshire county boundary and is situated at SP 944 143. It is an excellent place for migrant waders and roosting gulls and can be adequately 'scoped from the west bank.
At the Pitstone roundabout on the B489, take the road towards Aldbury and after 100 yards, park in the layby on the right at SP 942 141. Carefully cross the road and enter the wood opposite and follow the public footpath right for 75 yards. A track then leads off to the left and comes out through tall nettles to the top of the chalk quarry bank from where the entire quarry can be 'scoped. The gulls and waders tend to congregate on the edge of the islands.