Indos (Indus) and its tributaries are: Hydaspes (Jhelum), Akesines (Chenab), Hydroatis (Ravi), Hyphasis (Satluj) and Hesidros (Beas). How to explain the phonetic changes, assuming ancient versions of sindhu, vipasa, vitasta, zatadru, asikni etc. kalyanaraman kalyan97 at yahoo.com