As per the Uttararamayana, Kumbhakarna and his wife Vajrajwala had 2 sons – Kumbha and Nikumbha. They were ferocious warriors. Kumbha defeated the vanara army many times. Though many of Sugriva’s ministers tried to defeat him, they were unsuccessful. Angad also became weary of fighting him. Then Sugriva battled with Kumbha. Sugriva threw Kumbha into the Lavana ocean, and it was said that the ocean went up as high as the Vindhyas. When Kumbha emerged enraged, Sugriva killed him with his bare hands as per Ramayana Yudhakanda Sarga 76.