KotwaliDarwaza is an archway to enter the capital of the ancient city of Gaur. To enter the capital of ancient Gaur, the inhabitants of the southern ‘city suburbs’ had to cross this arch. This was also the south-facing path of the inhabitants of the fort. This arch is 312 feet high and 16 feet wide. The length of the entrance is 17 feet 4 inches. The naming of KotwaliDarwaza is in imitation of the Persian synonym 'Kotwal' of the city police. This city police (Kotwal) was engaged in guarding the southern walls of Gaur city. At present it is almost destroyed. The height of the arch between these entrances is 9.15 m and the width is 5.10 m. To the east and west of this entrance is a perforated wall through which shots, or arrows were fired at the enemy. It had a semicircular tower with a sloping front on both the inside and the outside. At present part of the outer turret can be seen with a huge convex outline with lined holes. The defensive walls on the sides of the towers still exist and extend far to the east and west. The western wall extends to the river, and the eastern wall extends slightly within the Indian border. This wall then re-entered India through Bangladesh. The thick mud walls show how strong the city's defenses were then. The inside and outside of the entrance arches are adorned with carved panels on both sides and hanging motifs inside the panels. Some of these panels still survive. On either side of this arch were two circular houses of 6 feet in diameter. There used to be a sentry guarding with firearms. Both the arches and the reservation were decorated with different types of herbs. This entrance is one of the masterpieces of ancient Muslim architecture. It is believed to be a contemporary architectural monument of Sultan AlauddinKhilji. As a result, this pattern is believed to have been built earlier after 1229 (Hijri 627) AD. This ancient architecture is located in Shibganjupazila of Chapainawabganj district, 35 km north of the district townChapainawabganjand just from the historic Sonamosjid