Kigali in the 1980s. Business in Rwanda has been growing in the 21st century, and many new buildings have arisen across the city, including the BCDI Tower, Centenary House, Kigali City Tower and Kigali Convention Centre. Tourism provides important input into the economy. Kigali is a province-level city governed by a city council who appoints an executive committee to run the day-to-day operations of the city. The executive committee consists of a mayor and two deputies. The city is split into three administrative districts: Gasabo, Kicukiro, and Nyarugenge. It contained parts of the former province of Kigali Rural. The administrative head
Kigali three administrative districts—Nyarugenge, which lies in the south west, Kicukiro in the south east, and Gasabo, which occupies the northern half of the city's territory. Kigali lies in a region of rolling hills, with a series of valleys and ridges joined by steep slopes. Kigali lies between the two mountains of Mount Kigali and Mount Jali, both of which have altitudes over , while the lowest areas of the city have an altitude of . Geologically, the city lies in a granitic and metasedimentary region, with lateritic soils on the hills and alluvial soils in the valleys. The Nyabarongo River,