The world's largest deposit of natural bitumen, known as the Athabasca oil sands, is located in the McMurray Formation of Northern Alberta.
ðə wˈɜːldz lˈɑːɹdʒɪst dᵻpˈɑːzɪt ʌv nˈætʃɚɹəl bɪtˈuːmɛn, nˈoʊn æz ðɪ ˈæθɐbˌæskə ˈɔɪl sˈændz, ɪz loʊkˈeɪɾᵻd ɪnðə mək mˈɜːɹeɪ fɔːɹmˈeɪʃən ʌv nˈɔːɹðɚn ælbˈɜːɾə.