Brač is a Croatian island in the Adriatic Sea, with an area of 396 square kilometres (153 sq mi), making it the largest island in Dalmatia, and the third largest in the Adriatic. It is separated from the mainland by the Brač Channel, which is 5 to 13 km wide. The island's tallest peak, Vidova gora, or Mount St. Vid, stands at 780 m (2,560 ft), making it the highest point of the Adriatic islands. The island has a population of 13,931, living in twenty-two settlements, ranging from the main town Supetar, with more than 3,400 inhabitants, to Murvica, where less than two dozen people live. Brač Airport on Brač is the largest airport of all islands surrounding Split.

The Adriatic Sea is a body of water separating the Italian Peninsula from the Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto to the northwest and the Po Valley. The countries with coasts on the Adriatic are Albania, Bosnia and Herzegovina, Croatia, Italy, Montenegro, and Slovenia.