state are Sipahijola, Gumti, Rowa and Trishna wildlife sanctuaries. National parks of the state are Clouded Leopard National Park and Rajbari National Park. These protected areas cover a total of . Gumti is also an Important Bird Area. In winter, thousands of migratory waterfowl throng Gumti and Rudrasagar lakes. Administrative divisions In January 2012, major changes were implemented in the administrative divisions of Tripura. There had previously been four districts – Dhalai (headquarters Ambassa), North Tripura (headquarters Kailashahar), South Tripura (headquarters Udaipur, Tripura), and West Tripura (headquarters Agartala). Four new districts were carved out of the existing four in January 2012 – Khowai, Unakoti, Sipahijala and Gomati. Six new subdivisions and five new blocks were also added. Each is governed by a district collector or a district magistrate, usually appointed by the Indian Administrative Service. The subdivisions of each district are governed by a sub-divisional magistrate and each subdivision is further divided into blocks. The blocks consist of Panchayats (village councils) and town municipalities. As of 2012, the state had eight districts, 23 subdivisions and 58 development blocks. National census and state statistical reports are not available for all the new administrative divisions, as of March 2013. Agartala, the capital of Tripura, is the most populous city. Other major towns with a population of 10,000 or more (as per 2015 census) are Sabroom, Dharmanagar, Jogendranagar, Kailashahar, Pratapgarh, Udaipur, Amarpur, Belonia, Gandhigram, Kumarghat, Khowai, Ranirbazar, Sonamura, Bishalgarh, Teliamura, Mohanpur, Melaghar, Ambassa, Kamalpur, Bishramganj, Kathaliya, Santirbazar and Baxanagar. Government and politics Tripura is governed through a parliamentary system of representative democracy, a feature it shares with other Indian states. Universal suffrage is granted to residents. The Tripura government has three branches: executive, legislature and judiciary. The Tripura Legislative Assembly consists of elected members and special office bearers that are elected by the members. Assembly meetings are presided over by the Speaker or the Deputy Speaker in case of Speaker's absence. The Assembly is unicameral with 60 Members of the Legislative Assembly (MLA). The members are elected for a term of five years, unless the Assembly is dissolved prior to the completion of the term. The judiciary is composed of the Tripura High Court and a system of lower courts. Executive authority is vested in the Council of Ministers headed by the Chief Minister. The Governor, the titular head of state, is appointed by the President of India. The leader of the party