Question: The bazaar in which the Mustafa Pasha Mosque is located is situated on eastern bank of what river?
Context: The Old Bridge (Bulgarian: Стар мост , "Star most") or Mustafa Pasha Bridge is a 16th-century arch bridge over the Maritsa in Svilengrad, southern Bulgaria.  Completed in 1529, it was built on the order of the Ottoman vizier Çoban Mustafa Pasha.  The bridge was the first major work designed by the Ottoman architect Mimar Sinan, and was part of a vakıf complex that also included a caravanserai, mosque, bazaar and hamam.  The bridge is 295 m long, 6 m wide and has 20 or 21 arches. The Gazi Atik Ali Pasha Mosque (Turkish: "Gazi Atik Ali Paşa Camii" ) is an old Ottoman mosque located in the Çemberlitaş neighbourhood of the Fatih district in Istanbul, Turkey.  Its construction was started under the orders of the future Grand Vizier Hadım Atik Ali Pasha in 1496 and was completed in 1497, during the reign of Sultan Bayezid II.  The mosque is located near the entrance to the Kapalıçarşı (Grand Bazaar), the Column of Constantine, and the historical Nuruosmaniye Mosque. The Old Bazaar (Macedonian: Стара чаршија, "Stara čaršija" ; Albanian: "Çarshia e Vjetër" ; from the Turkish: "Çarşı" meaning "marketplace") is a bazaar located in Skopje, situated on the eastern bank of the Vardar River, stretching from the Stone Bridge to the Bit-Pazar and from the Skopje Fortress to the Serava river.  The Old Bazaar falls primarily within the borders of Čair Municipality but a part of it is located in Centar Municipality.  As one of the oldest and largest marketplaces in the Balkans, it has been Skopje's centre for trade and commerce since at least the 12th century. The Hassan Pasha Mosque (Arabic: مسجد حسن الباشا‎ ‎ , "Masjid Hassan el-Basha"), also referred to as the Pasha Mosque or the Grand Mosque, is a mosque located in Oran, Algeria.  It was built in 1796 by order of Baba Hassan, Pasha of Algiers, in memory of the expulsion of the Spanish. Atik Mustafa Pasha Mosque (Turkish: "Atik Mustafa Paşa Camii" ; also named "Hazreti Cabir Camii") is a former Eastern Orthodox church in Istanbul, converted into a mosque by the Ottomans.  The dedication of the church is obscure.  For a long time it has been identified with the church of Saints Peter and Mark, but without any proof.  Now it seems more probable that the church is to be identified with Saint Thekla of the Palace of Blachernae (Greek: Άγία Θέκλα τοῦ Παλατίου τῶν Βλαχερνών , "Hagia Thekla tou Palatiou tōn Vlakhernōn").  The building belongs stylistically to the eleventh-twelfth century. Mustafa Pasha Mosque (Macedonian: Мустафа-пашина џамија ; ; Turkish: "Mustafa Paşa Camii" ) is an Ottoman-era mosque located in the Old Bazaar of Skopje, Macedonia. Mustafa Pasha Mosque is an Ottoman-era mosque in Skopje, Macedonia. Merzifonlu Kara Mustafa Pasha (Ottoman Turkish: مرزيفونلى قره مصطفى پاشا‎ , "Merzifonlı Ḳara Muṣṭafā Paşa"; "Mustafa Pasha the Courageous of Merzifon"; 1634/1635 – 25 December 1683) was an Ottoman military commander and Grand Vizier, who was a central character in the Ottoman Empire's last attempts at expansion into both Central and Eastern Europe. Koca Mustafa Pasha Mosque (Turkish: "Koca Mustafa Paşa Camii" ; also named "Sünbül Efendi Camii") is a former Eastern Orthodox church converted into a mosque by the Ottomans, located in Istanbul, Turkey.  The church, as the adjoining monastery, was dedicated to Saint Andrew of Crete, and was named Saint Andrew in Krisei or by-the-Judgment (Greek: , "Monē tοu Hagiοu Andreοu en tē Krisei").  Although heavily transformed during both the Byzantine and the Ottoman eras, it is one among the few churches in Istanbul still extant, whose foundation goes back to the sixth century. The Lala Mustafa Pasha Mosque (Turkish: Lala Mustafa Paşa Camii), originally known as the Cathedral of Saint Nicholas and later as the Ayasofya (Saint Sophia) Mosque of Mağusa, is the largest medieval building in Famagusta, Northern Cyprus.  Built between 1298 and c. 1400, it was consecrated as a Roman Catholic cathedral in 1328.  The cathedral was converted into a mosque after the Ottoman Empire captured Famagusta in 1571 and it remains a mosque to this day.  From 1954 the building has taken its name from Lala Mustafa Pasha, the Grand Vizier of the Ottoman Empire from Sokolovići in Bosnia, who served Murat III and led Ottoman forces against the Venetians in Cyprus.
Answer: Vardar River