The smaller of the two states named after the River Congo, sometimes known as Congo (Brazzaville), lies on the northern bank of the river. Most of the population lives in the southern cities, while the northern jungles, because of their poor access and swamps, provide a secure home for a variety of wildlife, especially gorillas. Oil revenues have helped with the country’s development, and there are also diamonds and natural gas. The River Congo is one of the world’s great rivers, draining a huge area of Africa. It is also probably the deepest river. Much of it is navigable, and it provides vital transport links. Brazzaville, the capital, has suffered from civil war, which damaged its most iconic building, the cylindrical Nabemba Tower, tallest skyscraper in Central Africa. Not far away the river flows over the spectacular rapids known as the Livingstone Falls. The main seaport is Pointe Noire, on the Atlantic coast. There is a strong tradition of folk music, similar in style to that found in the neighbouring Democratic Republic.