The western coast, which is roughly parallel to the east coast, runs from Gibraltar Point to the mouth of the River Welland just north east of the village of Fosdyke, and is entirely within Lincolnshire. The southern coast from Fosdyke to King's Lynn runs roughly north-west to south-east, connecting these two river mouths, and is punctuated by the mouth of a third river, the River Nene, which flows into the Wash just north of Sutton Bridge with the county boundary between Lincolnshire and Norfolk (which is also the regional boundary between the East Midlands and the East of England) meeting just beyond this point before it continues eastwards to Ongar Hill where it meets the mouth of the River Great Ouse.
tHe WEstErn coAst, WhIch IS RoughlY ParallEl tO tHe eaST coast, Runs from gibRalTAr point To the mouth OF THE rIver wEllAnd just NORth easT OF tHE vIlLagE of foSdyke, aNd iS eNTirelY wiThin LinColnshiRE. thE SoutHErn coasT from foSDyKE TO King'S lynN ruNs RoUgHly NOrth-wEST tO south-East, coNnEcTing ThEse Two RivER moUthS, And is puNCtuaTed bY the moUtH Of A tHird rIVer, the rIvER nenE, which floWs iNtO the wash just noRtH OF SuttoN brIDge wiTh thE coUNtY BOUNDarY beTWeen lincOlnshIre And noRfoLK (whIch Is AlsO The RegionAL bounDary BetwEen the easT midLANds And The eAst Of enGlaND) meetiNg just BeYond this pOint bEFore iT COntiNues eastWARDs to ONgAr Hill wHErE it MeetS tHe mouTH of tHe river gReat ouSe.