Usedom (Polish: Uznam) is an island in the Baltic Sea belonging both to Germany (larger western part) and to Poland (smaller eastern part). It's a popular summer sea resort for people from Eastern Germany and Poland.
The island is small and therefore only the border divides the island in a German and Polish part. Due to the EU and Schengen accession of Poland, the border control is now rather brief.
Standard Hochdeutsch is spoken throughout the German portion of the island. Traditional Low German dialects are still alive as well. Both Polish and some German are spoken on the Polish side.