twˈɛlv mˈaɪl ˈaɪlənd ænd fˈoːɹtiːn mˈaɪl ˈaɪlənd ɑːɹ nˈeɪmd fɔːɹ ðɛɹ dˈɪstənsᵻz,  ænd , ˌʌp ðɪ ˈælɪɡhˌɛni ɹˈɪvɚ fɹʌmðə kˈɑːnfluːəns ʌvðɪ ˈælɪɡhˌɛni ænd mˌɑːnoʊŋɡɐhˈɛlɚ ɹˈɪvɚz tə fˈɔːɹm ðɪ oʊhˈaɪoʊ ɹˈɪvɚɹ ɪn dˈaʊntaʊn pˈɪtsbɜːɡ.
Twelve Mile Island and Fourteen Mile Island are named for their distances,  and , up the Allegheny River from the confluence of the Allegheny and Monongahela Rivers to form the Ohio River in downtown Pittsburgh.