Ulaanbaatar is divided into nine districts (Düüregs): Baganuur, Bagakhangai, Bayangol, Bayanzürkh, Chingeltei, Khan Uul, Nalaikh, Songino Khairkhan, and Sükhbaatar. Each district is subdivided into Khoroos. The capital is governed by a city council (the Citizen's Representatives Hural) with forty members, elected every four years. The city council appoints the mayor. Ulaanbaatar is governed as an independent first-level subdivision of Mongolia, separate from Töv Aimag, the province that surrounds Ulaanbaatar.