Where was Nag last seen in Rikki tikki tavi?

In "Rikki-Tikki-Tavi," Nag was last seen in the bathroom, where he confronted Rikki-Tikki after the mongoose had killed his wife, Nagaina. Rikki-Tikki ultimately fights Nag and defeats him by attacking him in the darkness of the bathroom, ensuring the safety of the garden and its inhabitants. This climactic battle highlights Rikki-Tikki's bravery and determination to protect his home.