suppress superfluous or deprecated tags; ensure closed coastlines and exclusion of coastal islands (tag them as islets); add an islet
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Hosting is supported by UCL, Bytemark Hosting, and other partners.
You are either using a browser that does not support JavaScript, or you have disabled JavaScript.
OpenStreetMap uses JavaScript for its slippy map.