English: The Khania Dighi Mosque, also known as Chamchika Mosque & Rajbibi Mosque in Chapai Nawabganj in Rajshahi, Bangladesh. Khania Dighi Mosque is located on bank of Khania Dighi which is about a quarter mile away from the high mud wall of the ancient city of Gaur on the north and the Balia Dighi on the west in Nawabganj district. It’s a 14th century Mosque, a valuable archeological heritage of Bangladesh.