Gungwa reMarmara (; Turkish: Marmara Denizi), rinozivikanwawo seGungwa reMarmora kana Gungwa reMarmara, uye mumamiriro ekare ekare sePropontis igungwa remukati, riri mukati memiganhu yeTurkey, rinobatanidza Gungwa Dema neGungwa reAegean, nekudaro richiparadzanisa zvikamu zveAsia neEurope zveTurkey.
Istanbul