Which one territory of the following was not a part of Ashoka’s empire?

Explanation

Sri Lanka was not included in Ashoka’s empire. Ashoka’s Second Rock Edict indicates that Ashoka’s authority in India extended everywhere except Chola, Pandya, Satiyaputta, Keralaputta, and Tamraparni (Sri Lanka). These states were called Pratyanta, i.e., frontier/border states.