The Federal Republic of Tumbra, as a federal state, consists of twenty-five partly sovereign states. Twenty-two of the states are called provinces, while the remaining three - Straton, the nation's capital, Harren, and Bencoolen - are called city-states. Federalism is one of the core principles of the modern Tumbran state, however the power of the individual states is not as powerful as in other federated states, due to the fact that any reserve powers not granted specifically to federal governments are retained by the federal government, instead of being distributed to the states themselves.
Each state has a unicameral legislative assembly, and their head of state is a Governor, appointed by the President with Senate confirmation; the Governor serves concurrently with the President's term, and serves as the President's surrogate in all forms. Should there not be a Governor to exercise the functions of the President, by constitutional convention the Vice President takes on the responsibilities of the Governor until a new one is nominated.