Ọ dị n'etiti North Atlantic Ocean na North Sea na ndịda ọwụwa anyanwụ na-abịa n'ime 22 kilomita (35 km) nke ụsọ oké osimiri nke Northern France, site na nke ọ na-kewapụrụ site na English Channel. Na 1993 10 pasent nke UK bụ ọhịa, 46 pasent eji maka ahịhịa na 25 pasent na-akọ ugbo. The Royal Greenwich Observatory na London họọrọ dị ka na-akọwapụta isi nke Prime Meridian na 1884, ọ bụ ezie na ọ bụ agaghịkwa. The mba enyene kasị akụkụ nke British Isles agwaetiti na-agụnye agwaetiti Great Britain, n'ebe ugwu ọwụwa anyanwụ otu-nke isii nke agwaetiti Ireland na ụfọdụ obere gbara ya gburugburu agwaetiti. Ọ na-adị n'etiti North Atlantic Ocean na North Sea na ndịda ọwụwa anyanwụ n'ụsọ oké osimiri na-abịa n'ime 22 kilomita (35 km) nke ụsọ oké osimiri nke Northern France, site na nke ọ na-kewapụrụ site English Channel.
Ọwa Mmiri Ingland