Mahasthangarh is one of the earliest urban archaeological sites discovered thus far in Bangladesh. The village Mahasthan in Shibganj upazila of Bogra District contains the remains of an ancient city which was called Pundranagara or Paundravardhanapura in the territory of Pundravardhana. A limestone slab bearing six lines in Prakrit in Brahmi script recording a land grant, discovered in 1931, dates Mahasthangarh to at least the 3rd century BCE. It was an important city under the Maurya Empire. The fortified area was in use until the 8th century CE.
Mahasthangarh (Pundranagar), the ancient capital of Pundravardhana is located 11 km (6.8 mi) north of Bogra on the Bogra-Rangpur highway, with a feeder road (running along the eastern side of the ramparts of the citadel for 1.5 km) leading to Jahajghata and site museum. Buses are available for Bogra from Dhaka and take 4 and half hours for the journey via Bangabandhu Jamuna Bridge across the Jamuna River. Buses are available from Bogra to Mahasthangarh. Rickshaws are available for local movement. Hired transport is available at Dhaka/ Bogra. Accommodation is available at Bogra. When travelling in a hired car, one can return to Dhaka the same day, unless somebody has a plan to visit Somapura Mahavihara at Paharpur in the district of Naogaon and other places, or engage in a detailed study.
It is believed that the location for the city in the area was decided upon because it is one of the highest areas in Bangladesh. The land in the region is almost 36 metres (118 ft) above sea level, whereas Dhaka, the capital of Bangladesh, is around 6 metres (20 ft) above sea level. Another reason for choosing this place was the position and size of the Karatoya, which as recently as in the 13th century was three times wider than Ganges.
Mahasthangarh stands on the red soil of the Barind Tract which is slightly elevated within the largely alluvium area. The elevation of 15 to 25 metres above the surrounding areas makes it a relatively flood free physiographic unit.