Mahasthangarh, Archaeological site in Bogura District, Bangladesh.

Mahasthangarh is an archaeological site in Bogura District, Bangladesh, where a rectangular citadel extends across one and a half kilometers. Multiple gateways lead into the complex, including Kata Duar and Tamra Dawaza, providing access to the ruins.

The 1931 discovery of a limestone slab with six lines of Prakrit in Brahmi script dates the city to at least the 3rd century BCE, when it was an important Maurya Empire city called Pundranagara. The fortified area remained in use until the 8th century CE. Francis Buchanan Hamilton first located the ruins in 1808, and Alexander Cunningham identified them as the capital of Pundravardhana in 1879.

The name derives from Mahasthan, meaning great place, and reflects its long veneration as a sacred ground. Visitors today see temple remains and religious structures showing how people of different faiths practiced their rituals here.

The site sits 36 meters (118 feet) above sea level on red soil of the Barind Tract and is reachable from the Bogra to Rangpur road. Walking through the large grounds takes several hours and requires comfortable shoes.

The 1931 find of a limestone slab with six lines of Prakrit in Brahmi script records a Mauryan-era order by Ashoka to distribute grain and money from the royal treasury to famine victims. The citadel's rampart stands 11 to 13 metres above the surrounding plain, and until the 1920s the interior was over 4 metres higher than the land outside.