Quick guide

Geography persists, even as administration changes. The map begins with the counties, then lets you compare other boundary systems across them.

Use Definition A or B to switch how detached parts are shown.

Only one comparison layer shows at a time, so each selection stays easy to read.

You can search for counties, places, major features and postcodes, then export or save the current view.

Sources and standards

This map conforms to the Historic Counties Standard.

• Contains border data provided by the Historic County Borders Project © Historic Counties Trust.
• Contains OpenStreetMap data © OpenStreetMap contributors.
• Contains Ordnance Survey data © Crown copyright and database right 2026.
• Contains National Statistics data © Crown copyright and database right 2026.