Sudan is situated in northern Africa, bordering the Red Sea and it has a coastline of 853 km along the Red Sea.[34] With an area of 2,505,810 square kilometres (967,499 sq mi), it is the largest country in the continent and tenth largest in the world. It borders the countries of Central African Republic, Chad, Democratic Republic of the Congo, Egypt, Eritrea, Ethiopia, Kenya, Libya and Uganda. It is dominated by the River Nile and its tributaries.

The terrain is generally flat plains, broken by several mountain ranges; in the west the Jebel Marra is the highest range; in the south is the highest mountain Mount Kinyeti Imatong, near the border with Uganda; in the east are the Red Sea Hills.