Mosque Omerbasica is located in the old town of Bar. It was constructed in 1662. Its structure is rather simple, with rectangular base, and minaret built next to the south-west wall. At the beginning of the 17th century, Derviš Hasan’s domed burial site was built beside the mosque, at the entrance to the complex. The smaller ground floor building was built next to it and was used as a residential building. A public fountain was constructed near the entrance and later, a mosque house for a Muslim priest or imam was built as well. The whole area is surrounded by a stone wall.