Hulunbuir is a prefecture-level city in North China's Inner Mongolia autonomous region, with a total area of 253,000 square kilometers. The city has two districts, five county-level cities and seven banners under its jurisdiction.

Hulunbuir is in the northeast of Inner Mongolia autonomous region and is named after Hulun Nur Lake and Buir Lake – both located within its territory. 

Hulunbuir borders Russia in the north and northwest by the Ergune River and borders Mongolia in the west and southwest. Hulunbuir shares a 1,733.32-km border with Russia and Mongolia.

The city has a three-dimensional transportation network comprising railways, highways and aviation facilities. Binzhou Railway and National Highway 301 run through the city. 

It has two international airports, in Hailaar and Manzhouli, operating more than 50 flight routes, including international destinations in Russia and Mongolia, as well as domestic destinations such as Beijing, Hohhot, Harbin, Shanghai, and Guangzhou. 

As the only city adjacent to both Russia and Mongolia, Hulunbuir has opened eight national-level ports, including Manzhouli and Heishantou.