#1337 διθάλασσος dithalassos {dee-thal'-as-sos}

 from G1364 and G2281; TDNT - n/a; adj

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) resembling or forming two seas: thus of the Euxine Sea
 2) lying between two seas, i.e. washed on both sides by the sea
    2a) an isthmus or tongue of land, the extremity of which is
        covered by the waves
    2b) a projecting reef or bar against which the waves dash
        on both sides

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - where two seas meet 1; 1

—Exhaustive Concordance (KJV Translation Frequency & Location)