County Gates is the historic crossing point between the shire counties of Dorset and Hampshire. On April 1, 1974 when Bournemouth and Christchurch were incorporated into Dorset, it became the main crossing point between the Borough of Poole and the Borough of Bournemouth. Since 2019, both Borough of Poole and Borough of Bournemouth have become part of the unitary authority Bournemouth, Christchurch and Poole, hence County Gates is no longer a crossing point. County Gates sits on the A35 road.
Today, County Gates is a busy gyratory that sits on the west of Westbourne. In the centre of the roundabout is the Liverpool Victoria (LV) headquarters. The roundabout feeds to and from Poole Road (A35), Wessex Way (A338), Lindsay Road, The Avenue which leads to Branksome Park, Canford Cliffs and Sandbanks, and Seamoor Road which leads into Westbourne. The A35 used to continue along Poole Road into central Bournemouth but now resumes at the junction with the A338 near Bournemouth Railway Station.