Coordinates : 49 ° 42 ′ 14 ″ N 2 ° 13 ′ 4 ″ W \ / 49.70389 ° N 2.21778 ° W \ / 49.70389 ; -2.21778 Lager Sylt was a Nazi concentration camp on Alderney in the British Crown Dependency of the Channel Islands , in operation between March 1943 and June 1944 .
Coordinates : 49 ° 42 ′ 14 ″ N 2 ° 13 ′ 4 ″ W \ / 49.70389 ° N 2.21778 ° W \ / 49.70389 ; -2.21778 Lager Sylt was a Nazi concentration camp on Alderney in the Channel Islands , in operation between March 1943 and June 1944 .