The highest peak in Nagaland is:

Mount Tiyi
Mount Saramati
Mount Japfu
Dzukou Peak

The correct answer is Mount Saramati. It is the highest peak in Nagaland, India, and the easternmost peak of the Himalayas. It is located in the Tuensang district of Nagaland, near the border with Myanmar. The peak is 3,841 meters (12,609 feet) above sea level.

Mount Tiyi is the second highest peak in Nagaland, at 3,710 meters (12,172 feet). It is located in the Wokha district of Nagaland.

Mount Japfu is the third highest peak in Nagaland, at 3,648 meters (12,034 feet). It is located in the Kohima district of Nagaland.

Dzukou Peak is a mountain pass in Nagaland, India. It is located in the Kohima district of Nagaland, near the border with Myanmar. The pass is 3,430 meters (11,253 feet) above sea level.