It is also known by the following geographical or historical names: Principal cities: London, Manchester, Birmingham, Edinburgh, Liverpool, Bristol, Belfast, Glasgow, Cardiff, Dublin, Limerick, Las Palmas de Gran Canaria, Santa Cruz de Tenerife, Lisbon, Porto Notes: Principal cities: Reykjavík, Accra, Bamako, Dakar, Abidjan, Conakry, Ouagadougou, São Tomé, Bissau, Monrovia, Bamako, Nouakchott, Freetown, Lomé, El Aaiún (Laayoune), Tifariti, Tindouf

Notes: Since legal, political, social and economic criteria, in addition to physical or geographical criteria, are used in the drawing of time zones, actual time zones do not precisely adhere to meridian lines.

The UTC+00:00 time zone, were it determined purely by longitude, would consist of the area between meridians 7°30′W and 7°30′E.

However, in much of Western and Central Europe, despite lying between those two meridians, UTC+01:00 is used; similarly, there are European areas that use UTC, even though their physical time zone is UTC−01:00 (e.g. most of Portugal), or UTC−02:00 (the westernmost part of Iceland).

Because the UTC+00:00 time zone in Europe is at its western edge, Lowestoft in the United Kingdom, at only 1°45′E, is the easternmost settlement in Europe in which UTC+00:00 is applied.