库苏古尔省
The north of the aimag is characterized by alpine forests, gradually blending in the arid steppe plains of the central Mongolian highland. The main rivers are the Orkhon and the Selenge, first of which enter the aimag from Övörkhangai while the second is enters from Khövsgöl Province. As a result, southern and central Bulgan is one of Mongolia's few arable regions.