lˈaɪɪŋ ɔnðə sˈiː ɹˈaʊts ɡˌoʊɪŋ sˈaʊθ fɹʌmðɪ ˈɪŋɡlɪʃ tʃˈænəl, sˈeɪn ɪz wˈɛl nˈoʊn fɚðə dˈeɪndʒɚz ʌv ɪts wˈɔːɾɚz, ðə tʃɔːsˈeɪ də sˈeɪn, ɐ vˈæst zˈoʊn ʌv ɹˈiːfs stɹˈɛtʃɪŋ mˈoːɹ ðɐn θˈɜːɾi mˈaɪlz fɹʌm ˈiːst tə wˈɛst, ɹᵻkwˈaɪɚɹɪŋ nˈuːmɚɹəs lˈaɪthaʊsᵻz, bˈiːkənz, ænd bˈɔɪz.
Lying on the sea routes going south from the English Channel, Sein is well known for the dangers of its waters, the Chaussée de Sein, a vast zone of reefs stretching more than 30 miles from east to west, requiring numerous lighthouses, beacons, and buoys.