Brazzaville is the capital and largest city of the Republic of the Congo and is located on the Congo River. As of the 2007 census, it has a population of 1,373,382 in the city proper, and about 2 million in total when including the suburbs located in the Pool Region. The populous city of Kinshasa (more than 10 million inhabitants in 2009), capital of the Democratic Republic of the Congo, lies just across the Congo River from Brazzaville. Together with Kinshasa, the combined conurbation of Kinshasa-Brazzaville has thus nearly 12 million inhabitants (although significant political and infrastructure challenges prevent the two cities from functioning with any meaningful connection). Over a third of the population of the Republic of Congo lives in the capital, and it is home to 40% of non-agricultural employment. It is also a financial and administrative capital. In order to distinguish between the two African countries with "Congo" in their names, the Republic of the Congo is sometimes called Congo-Brazzaville, as opposed to Congo-Kinshasa (the Democratic Republic of the Congo, known from 1971 to 1997 as Zaire, the capital of which is Kinshasa). Kinshasa lies on the southern bank of the Congo, across from Brazzaville. This is the only place in the world where two national capital cities are situated on opposite banks of a river, within sight of each other. While Kinshasa lies to the south, Brazzaville lies to the north of the Congo River. The city is 506 km (314 mi) inland from the Atlantic Ocean and approximately 474 kilometers south of the equator. The city is a commune that is separated from the other regions of the republic; it is surrounded by the Pool Region. Around the city is a large savanna. The town is relatively flat, and situated at an altitude of 317 metres (1,040 ft).