fɔːɹ mˈoʊst əv ɪts lˈɛŋθ, ɪt fˈɔːɹmz ðə kˈænədə juːnˈaɪɾᵻd stˈeɪts bˈoːɹdɚ, wɪððə pɹˈɑːvɪns ʌv kwᵻbˈɛk kˈænədə tʊ ɪts wˈɛst ænd ðə stˈeɪt ʌv nˈuː hˈæmpʃɚ juːnˈaɪɾᵻd stˈeɪts tʊ ɪts ˈiːst.
For most of its length, it forms the Canada–United States border, with the province of Quebec (Canada) to its west and the state of New Hampshire (United States) to its east.