Pronunciation: [ɹɪˈɒlə͡ʊ] (IPA)
Correct spelling for the English word "riolo" is [ɹɪˈɒlə͡ʊ], [ɹɪˈɒləʊ], [ɹ_ɪ__ˈɒ_l_əʊ] (IPA phonetic alphabet).