Beach at Formby (courtesy of Tom Pennington)

The Borough of Sefton is a metropolitan borough of Merseyside. The borough consists of a coastal strip of land on the Irish Sea, and extends from Bootle in the south, to Southport in the north. In the south-east, it extends inland to Maghull. The district is bounded by Liverpool to the south, Knowsley to the south-east, and West Lancashire to the east.

It is named after the village and parish of Sefton, near Maghull.