The border between the Black Sea and the Caspian is usually placed along the crest of the Caucasus Mountains, although it is sometimes placed further north.
ðə bˈoːɹdɚ bᵻtwˌiːn ðə blˈæk sˈiː ænd ðə kˈæspiən ɪz jˈuːʒuːəli plˈeɪst ɐlˈɔŋ ðə kɹˈɛst ʌvðə kˈɔːkæsəs mˈaʊntɪnz, ɔːlðˈoʊ ɪɾ ɪz sˈʌmtaɪmz plˈeɪst fˈɜːðɚ nˈɔːɹθ.