Connah's Quay lies along the Dee estuary in Flintshire, North Wales. It is bordered by Shotton to the east, Oakenholt to the north west, Ewloe to the south east and the Dee to the north. Nearby towns and villages include Flint, Halkyn, Bagillt, Northop, Buckley, Mold, Holywell and Chester. The National Cycle Network runs through Connah's Quay.

The town's placename is believed to have to come from a former landlord of "The Old Quay House", a public house which still lies on the docks in what is now the west side of the town. Others state that Connah was a man who owned a chandlery store on the docks. It has also been known, to some people, that Connah's Quay had got its name from a lady called Mary Connah. When people crossed the River Dee from places opposite, such as Parkgate or Neston, they would ask, "Could you take me to Connah's Quay," because Mary Connah used to own the Dock. The docks became known as "Connah's Quay" some time after the 1860s.

The parish church is dedicated to St Mark and dates back to 1836. A chancel was added to the building between 1876 and 1878 by architect John Douglas, and it is believed that the clock by J. Benson of London was installed in 1837. The font is Victorian, dating back to 1876, whilst the stained glass window to the left of it is slightly younger, being added to the building in 1912.