What made the Chola administration strong and effective?

The Chola administration was strong and effective because of following reasons:

1. The King was the pivot of administration and all the authority vested in his hands.
2. The King often went on tours in order to keep a check on the administration.
3. The Cholas were good administrators. The villages were not ruled by any government official but they were self governed by the villagers themselves. The villages had three types of assemblies, namely, the Ur, the Sabha and the Nagaram.