The largest natural deposit of bitumen in the world, estimated to contain 10 million tons, is the Pitch Lake of southwest Trinidad.
ðə lˈɑːɹdʒɪst nˈætʃɚɹəl dᵻpˈɑːzɪt ʌv bɪtˈuːmɛn ɪnðə wˈɜːld, ˈɛstᵻmˌeɪɾᵻd tə kəntˈeɪn tˈɛn mˈɪliən tˈʌnz, ɪz ðə pˈɪtʃ lˈeɪk ʌv saʊθwˈɛst tɹˈɪnɪdˌæd.