English: asba Mosque is an ancient nine-domed mosque and archaeological site, which derives its name from the village Qasba under Gurnadi Upazila in Barisal district, is located a few yards away from the Barisal-Faridpur highway. It is very similar to the Nine Dome Mosque in Bagerhat. This is a typical multi-domed square structure built entirely of well-burnt red bricks, save for the four stone pillars that support the domes on the roof. The walls are very massive with a thickness of 2.13m while the circular corner towers rise only up to the roof level. The mosque has three archways, on each of the north, south, and east sides. Of the three arches, the central one is the largest. It is to be noted here that in the north and south walls only the central archway is now open, while the flanking ones have been closed by brick filling. The three semi-circular mihrab niches inside the qibla wall are kept symmetrically large and small corresponding to the three entrances in the east wall. According to local tradition, it was built by Sabhi Khan in the early 16th century. It is almost the exact replica of the Nine Dome Mosque built by Khan Jahan Ali in Bagerhat and Masjidkur Mosque in Khulna. Though still in use, the mosque is a protected monument by the Department of Archaeology.