Rwanda, in east-central Africa, is surrounded by the Democratic Republic of the Congo, Uganda, Tanzania, and Burundi. Steep mountains and deep valleys cover most of the country. Lake Kivu in the northwest is the highest lake in Africa (1,472 m). Extending north of it are the Virunga Mountains, which include the volcano Karisimbi (14,187 ft; 4,324 m), Rwanda's highest point. Rwanda’s capital is Kigali. Rwanda’s population 12,3 million people. The country's principal language is Kinyarwanda, which is spoken by most Rwandans. The major European languages during the colonial era were German, and then French, which was introduced by Belgium and remained an official and widely spoken language after independence.