Promajna is located in the municipality Baška Voda, in Split-Dalmatia County and it covers the area of 4.96 km² (1.92 sq. miles). According to the 2011 census report, there were 336 inhabitants. It is predominantly populated by Croats (94%), but also Serbs (4%). Nearby places: Krvavica, Bast, Baška Voda, Veliko Brdo, Brela, Makarska, Rastovac, Zagvozd, Sumartin and Gornja Brela.