At its greatest extent, the empire stretched along the natural boundary of the Himalayas, to the east into Bengal, to the west into what is present-day Balochistan, Pakistan and the Hindu Kush mountains of what is now eastern Afghanistan. The dynasty expanded into India's southern regions by the reign of the emperor Bindusara, but it excluded Kalinga (modern Odisha), until it was conquered by Ashoka. It declined for about 50 years after Ashoka's rule, and dissolved in 185 BCE with the foundation of the Shunga dynasty in Magadha.