Based on the search results, the correctly matched pairs are: - I. Asmaka | Godavari: Correct, as the Asmaka region is associated with the Godavari River. - IV. Kosala | Sarayu: Correct, as the Kosala region is associated with the Sarayu River. The other pairs are incorrect: - II. Kamboja | Vipas: Incorrect, as there is no evidence linking the Kamboja region with the Vipas (Beas) River. - III. Avanti | Mahanadi: Incorrect, as the Avanti region is associated with the Sipra and Narmada rivers, not the Mahanadi.