An EU States’ land borders, including river and lake borders, sea borders and their airports, river ports, sea ports and lake ports, provided that they are not internal borders.
As of December 2011, the Schengen Area consists of the following EU States: Belgium, Czech Republic, Denmark, Germany, Estonia, Greece, Spain, France, Italy, Latvia, Lithuania, Luxembourg, Hungary, Malta, Netherlands, Austria, Poland, Portugal, Slovakia, Slovenia, Finland and Sweden. This means that the other EU States (i.e. Bulgaria, Cyprus, Ireland, Romania and the United Kingdom) are not (yet) part of Schengen. Whilst Iceland, Liechtenstein, Norway and Switzerland are not EU States, they have signed an Association Agreement in order to be associated with the implementation, application and development of the Schengen acquis.