As well as the island of Jersey itself, the Bailiwick includes the nearly uninhabited islands of the Minquiers, Écréhous, the Pierres de Lecq and other rocks and reefs.

Together with the Bailiwick of Guernsey it forms the grouping known as the Channel Islands. The defence of all these islands is the responsibility of the United Kingdom.

However, Jersey is not part of the UK, nor the European Union, but is rather a separate possession of the Crown, comparable to the Isle of Man. Jersey belongs to the Common Travel Area.
More information is available from Jersey.com