Turkey controlled the Dardanelles
The answer is Turkey. The 1936 Montreux Convention establishes it as an International Shipping Lane with Turkey retaining the right to restrict Naval Traffic to Non-Black Sea nations.
If it is to the Mediterranean Sea it would be The Bosporus and The Dardanelles Strait's.
The Dardanelles Straight connects the Sea of Marmara to the Eagean Sea and the Bosphorous Straight connects it to the Black Sea
See the link below. The Dardanelles was not part of World War 2 but rather World War 1. Editor's note. It was the Brits (namely Winston Churchill, in World War 1, of the admiralty) who wanted to secure the Dardanelles strait to control shipping access. At the time Britain controlled Turkey. There was warring going on there during World War 1. See the link below for the story of the Battle of Dardanelles.
The Dardanelles were known as the Hellespont.
Dardanelles
Fight for the Dardanelles was created in 1915.
Dardanelles - band - was created in 2006.
Dardanelles Operation happened in 1807.
Dardanelles Army was created in 1916.
The Aegean Sea
The Dardanelles is the strait connecting the Aegean Sea and the Sea of Mamara.