Chandragupta Maurya was succeeded by his son, Bindusara, who expanded the kingdom over most of present-day India, other than the extreme south and east. At its greatest extent, the Empire stretched to the north along the natural boundaries of the Himalayas, and to the east stretching into what is now Assam. To the west, it reached beyond modern Pakistan, annexing Balochistan and much of what is now Afghanistan. The Empire was extended into India's central and southern regions by the emperors Chandragupta and Bindusara, but it excluded the republic of Kalinga.