Prudhoe Bay was the largest conventional oil field ever discovered in North America, but was much smaller than Canada's enormous Athabasca oil sands field, which by 2014 was producing about  of unconventional oil, and had hundreds of years of producible reserves at that rate.
pɹˈʌdhoʊ bˈeɪ wʌzðə lˈɑːɹdʒɪst kənvˈɛnʃənəl ˈɔɪl fˈiːld ˈɛvɚ dɪskˈʌvɚd ɪn nˈɔːɹθ ɐmˈɛɹɪkə, bˌʌt wʌz mˈʌtʃ smˈɔːlɚ ðɐn kˈænədəz ɪnˈoːɹməs ˈæθɐbˌæskə ˈɔɪl sˈændz fˈiːld, wˌɪtʃ baɪ tˈuː θˈaʊzənd fˈoːɹtiːn wʌz pɹədˈuːsɪŋ ɐbˌaʊt ʌv ʌŋkənvˈɛnʃənəl ˈɔɪl, ænd hæd hˈʌndɹɪdz ʌv jˈɪɹz ʌv pɹədˈuːsᵻbəl ɹɪzˈɜːvz æt ðæt ɹˈeɪt.