It lies between latitudes 11° and 24°N, and longitudes 0° and 16°E. Niger's area is 1,267,000 square kilometres (489,191 sq mi) of which 300 square kilometres (116 sq mi) is water. This makes it slightly less than twice the size of the US state of Texas, and the world's twenty-second largest country (after Chad).
Niger borders seven countries and has a total perimeter of 5,697 kilometres (3,540 mi). The longest border is with Nigeria to the south (1,497 km/930 mi). This is followed by Chad to the east, at 1,175 km (730 mi), Algeria to the north-northwest (956 km/594 mi), and Mali at 821 km (510 mi). Niger also has small borders in its far southwest with Burkina Faso at 628 km (390 mi) and Benin at 266 km (165 mi) and to the north-northeast Libya at 354 km (220 mi).
The lowest point is the Niger River, with an elevation of 200 metres (656 ft). The highest point is Mont Idoukal-n-Taghès in the Aïr Massif at 2,022 m (6,634 ft).