Also in Bigby, it crosses the Scunthorpe-Grimsby line, then three railway lines together at Wrawby Junction. North of Bigby village it crosses the western escarpment of the northern Lincolnshire Wolds, then skirts the southern and eastern perimeter of Humberside Airport. It crosses the A18 and B1210, then the B1211. The furthest north section of the district, and of the county, is where it meets a short section of the A180, where a few hundred metres west of the A160 interchange it meets North East Lincolnshire. It follows the New Beck Drain south-east across the B1210, and at Riby, the A1173 and A18. At Swallow it crosses the A46. It follows the Waithe Beck at Thorganby. At Swinhope it meets East Lindsey, next to Scallows Hall (in East Lindsey), and crosses the B1203, then again at Kirmond le Mire. It meets the B1225 High Street at Tealby, and for around two miles southwards is the district boundary, crossing the A631 at North Willingham. At Sixhills it deviates westwards from the B1225, next to the former RAF Ludford Magna (in East Lindsey). At Holton cum Beckering it crosses the B1202, then the A158 at Goltho, where it skirts the western edge of Wragby (in East Lindsey). It passes southwards in Bardney through Chamber's Farm Wood (mostly in East Lindsey); Chamber's Farm itself is in West Lindsey. It skirts the southern edge of the former RAF Bardney, and crosses the B1190 near Tupholme Abbey (in East Lindsey). East of Southrey (also in Bardney parish) it meets the River Witham and North Kesteven. It follows the River Witham westwards until Greetwell where it meets the City of Lincoln, deviates northwards, crossing the Lincoln - Market Rasen railway line. It follows the outskirts of Lincoln, crossing the B1182 (former A46) at Nettleham. It crosses the A15 north of the Riseholme roundabout, and follows a short section of the A57, then crosses it, near Bishop Bridge. A few hundred metres west it meets the Foss Dyke, which from there a mile north-west is the boundary with North Kesteven. At Saxilby with Ingleby it deviates westwards from the Foss Dyke, and at Broadholme (former Nottinghamshire until 1989) at the B1190 (Tom Otters Lane), it meets Nottinghamshire (Newark and Sherwood). It follows a half-mile section of Ox Pasture Drain north to the A57, which it briefly follows westwards until Kettlethorpe (A156 junction). It crosses the A1133 at Newton on Trent, and under a mile westwards it meets the River Trent and Bassetlaw, a mile north of the former High Marnham Power Station.