Jilin lies in the central part of northeastern China, bordering Russia and North Korea in the east and southeast respectively.
Jilin is highest in altitude in the southeast, and drops gently towards the northwest. The Changbai Mountains run through its southeastern regions, and contains the highest peak of the province, Baiyun Peak at 2691 m. Other mountain ranges include the Jilinhada Mountains, Zhang Guangcai Mountains, and Longgang Mountains.
Jilin is drained by the Yalu and Tumen Rivers in the extreme southwest (which together form the border between the People's Republic of China and North Korea), by tributaries of the Liao River along the southern border, and by the Songhua and Nen rivers, both eventually flowing into the Amur.