It is a central tenet of the EU maritime policy (Directorate-General for Maritime Affairs and Fisheries) that all seas have a particular nature, defined by their geography, their ecology, their economies and their people. Most seas are nested (e.g. Atlantic Ocean, Irish Sea, Morecambe Bay) and do not, except for specific purposes such as hydrography or fisheries management, have sharp, recognised boundaries. One important sea for purposes of fisheries management is referred to as the "seas West of Scotland". In line with the EU maritime policy, the sea does not only encompass the waters but also the people and economy of the areas bordering that sea.