Dar ‧ da ‧ nelles, the /ˌdɑːdəˈnelz $ ˌdɑːrdnˈelz/ BrE AmE
the long narrow area of sea between the Aegean Sea and the Sea of Marmara which separates the European and Asian parts of Turkey, and which was called the Hellespont in ancient times. The important World War I battle at ↑ Gallipoli took place in this area.