<P> The IHO defines the southwestern limit of the North Sea as `` a line joining the Walde Lighthouse ( France , 1 ° 55'E ) and Leathercoat Point ( England , 51 ° 10'N ) '' . The Walde Lighthouse is 6 km east of Calais ( 50 ° 59 ′ 06 '' N 1 ° 55 ′ 00 '' E ﻿ / ﻿ 50.98500 ° N 1.91667 ° E ﻿ / 50.98500 ; 1.91667 ) , and Leathercoat Point is at the north end of St Margaret 's Bay , Kent ( 51 ° 10 ′ 00 '' N 1 ° 24 ′ 00 '' E ﻿ / ﻿ 51.16667 ° N 1.40000 ° E ﻿ / 51.16667 ; 1.40000 ) . </P>
<P> The IHO defines the southwestern limit of the North Sea as `` a line joining the Walde Lighthouse ( France , 1 ° 55'E ) and Leathercoat Point ( England , 51 ° 10'N ) '' . The Walde Lighthouse is 6 km east of Calais ( 50 ° 59 ′ 06 '' N 1 ° 55 ′ 00 '' E ﻿ / ﻿ 50.98500 ° N 1.91667 ° E ﻿ / 50.98500 ; 1.91667 ) , and Leathercoat Point is at the north end of St Margaret 's Bay , Kent ( 51 ° 10 ′ 00 '' N 1 ° 24 ′ 00 '' E ﻿ / ﻿ 51.16667 ° N 1.40000 ° E ﻿ / 51.16667 ; 1.40000 ) . </P>
where does the english channel end and the north sea begin
where does the english channel end and the north sea begin
a line joining the Walde Lighthouse ( France , 1 ° 55'E ) and Leathercoat Point ( England , 51 ° 10'N )
a line joining the Walde Lighthouse ( France , 1 ° 55'E ) and Leathercoat Point ( England , 51 ° 10'N )