Wau is a city in northwestern South Sudan, on the western bank of the Jur River, that serves as capital for Western Bahr el Ghazal. It lies approximately 650 kilometres (400 mi) northwest of the capital Juba. A culturally, ethnically and linguistically diverse urban center and trading hub, Wau is also the former headquarters of Western Bahr el Ghazal.

South Sudan, officially the Republic of South Sudan, is a landlocked country in eastern Central Africa. It is bordered by Ethiopia, Sudan, the Central African Republic, the Democratic Republic of the Congo, Uganda, and Kenya, and includes the vast swamp region of the Sudd, formed by the White Nile and known locally as the Bahr al Jabal, meaning "Mountain Sea". The population was 11,088,796 in 2023, and Juba is the capital and largest city. South Sudan gained independence from Sudan on 9 July 2011, making it the most recent sovereign state or country with widespread recognition as of 2024.