The southeastern and southern sides of the parish forms a boundary with the parishes of Immingham and Habrough and with the administrative county of North East Lincolnshire, following the line of the main drain leading to South Killingholme Haven. The southwestern edge of the parish extends as far as, and included Ulceby railway station, east of the village of Ulceby, where the boundary is with the parishes of Brocklesby and Ulceby, much of the boundary following the line of the canalized Skitter Beck. The northwestern boundary is entirely with the parish of North Killingholme, running southeast-northwest; from the southern part along the West Mere Middle Road, then bisecting the Lindsey Oil Refinery, and exiting the bank of the Humber Estuary halfway between north and south Killingholme havens.