Po-i-Kalan or Poi Kalan is an Islamic religious complex located in Bukhara, Uzbekistan. The complex consists of three parts, the Kalan Mosque (Masjid-i Kalan), the Kalan Minaret (Minâra-i Kalân) to which the name refers to, and the Mir-i-Arab Madrasah. The positioning of the three structures creates a square courtyard in its center, with the Mir-i-Arab and the Kalan Mosque standing on opposite ends. In addition, the square is enclosed by a bazaar and a set of baths connected to the Minaret on the northern and southern ends respectively. The congregational mosque in the complex is one of the largest mosques in Central Asia behind the Bibi Khanum mosque located in Samarkand, Uzbekistan and the Great Mosque of Herat in Afghanistan