The judiciary of Pakistan is a hierarchical system with two classes of courts: the superior (or higher) judiciary and the subordinate (or lower) judiciary. The superior judiciary is composed of the Supreme Court of Pakistan, the Federal Shariat Court and five High Courts, with the Supreme Court at the apex. There is a High Court for each of the four provinces as well as a High Court for the Islamabad Capital Territory. The Constitution of Pakistan entrusts the superior judiciary with the obligation to preserve, protect and defend the constitution. Neither the Supreme Court nor a High Court may exercise jurisdiction in relation to Tribal Areas, except otherwise provided for. The disputed regions of Azad Kashmir and Gilgit–Baltistan have separate court systems.