Somapura Mahavihara (Bengali: সোমপুর মহাবিহার Shompur Môhabihar) in Paharpur, Badalgachhi Upazila, Naogaon District, Bangladesh (25°1'51.83"N, 88°58'37.15"E) is among the best known Buddhist viharas in the Indian Subcontinent and is one of the most important archeological sites in the country. It was designated a UNESCO World Heritage Site in 1985.