Question: Where is the blue mosque in the country where Karasu is located?

full_context: Document 1: Karacasu, Bolu: Karacasu is a belde (town) in the central district of Bolu Province, Turkey. It is situated far from Bolu to the north of Köroğlu Mountains. The population of Karacasu was 2,540 as of 2013. The town's economy depends on thermal springs.
Document 2: Mihrimah Sultan Mosque (Edirnekapı): As built, the Mihrimah Sultan Mosque had a külliye which included (besides madrasah) a double hamman, türbe and a low row of shops under the terrace upon which the mosque was built, whose rents were intended to financially support the mosque complex.
Document 3: Mosque of the Martyrs: The Mosque of the Martyrs (), also popularly known as the Turkish Mosque, is a mosque in Baku, Azerbaijan, near the Martyrs' Lane. The mosque was built in the beginning of the 1990s with assistance of the Turkish government. The mosque currently is used as an official residence of religious attaché of the Turkish embassy. The mosque has been under construction since 2009.
Document 4: Hagia Sophia: Hagia Sophia (/ ˈhɑːɡiə soʊˈfiːə /; from the Greek: Αγία Σοφία, pronounced (aˈʝia soˈfia), ``Holy Wisdom ''; Latin: Sancta Sophia or Sancta Sapientia; Turkish: Ayasofya) was a Greek Orthodox Christian patriarchal basilica (church), later an imperial mosque, and is now a museum (Ayasofya Müzesi) in Istanbul, Turkey. From the date of its construction in 537 AD, and until 1453, it served as an Eastern Orthodox cathedral and seat of the Patriarch of Constantinople, except between 1204 and 1261, when it was converted by the Fourth Crusaders to a Roman Catholic cathedral under the Latin Empire. The building was later converted into an Ottoman mosque from 29 May 1453 until 1931. It was then secularized and opened as a museum on 1 February 1935. Famous in particular for its massive dome, it is considered the epitome of Byzantine architecture and is said to have`` changed the history of architecture''. It remained the world's largest cathedral for nearly a thousand years, until Seville Cathedral was completed in 1520.
Document 5: Mihrimah Sultan Mosque (Edirnekapı): The  Mihrimah Sultan Mosque is a 16th century Ottoman mosque located in the Edirnekapı neighborhood near the Byzantine land walls of Istanbul, Turkey. It was commissioned by Mihrimah Sultan, the daughter of Suleiman the Magnificent and designed by the chief imperial architect Mimar Sinan. Sited on the peak of the Sixth Hill near the highest point of the city, the mosque is a prominent landmark in Istanbul.
Document 6: Belen, Tarsus: Belen is a village in Tarsus district of Mersin Province, Turkey. It is situated in the Taurus Mountains. Its distance to Tarsus is and to Mersin is . The population of Belen was 684 as of 2011. The area around Belen was populated in the Roman Empire era of the 2nd and 3rd centuries, evident from a necropolis area next to the village, but the village was founded during the Ottoman period. Main economic activities are agriculture animal breeding and poultry husbandry.
Document 7: Üç Şerefeli Mosque: The Üç Şerefeli Mosque was commissioned by Ottoman sultan Murad II (1421–1444,1446– 1451), and built between 1438 and 1447. It is located in the historical center of the city, close to the Selimiye Mosque and Old Mosque. The name refers to unusual minaret with three balconies (Turkish: üç şerefeli).The architect of the mosque is not known. It is built of Burgaz limestone with a main dome that is 24 m in diameter. When first built the dome was the largest in any Ottoman building. The mosque was severely damaged by fire in 1732 and by an earthquake in 1748 but was repaired on the order of Mahmut I.The two blue and turquoise underglaze-painted tile panels in the tympana of the windows were probably produced by the same group of tilemakers who had decorated the Yeşil Mosque (1419–21) in Bursa where the tiles are signed as "the work of the masters of Tabriz" (ʿamal-i ustadan-i Tabriz). The running pattern of the Chinese influenced floral border tiles is similar to those in the small Muradiye Mosque in Edirne.In the Şakaiki Numaniye Taş Köprü Zade  relates how 'Certain accursed ones of no significance' were burnt to death by Mahmut Paşa who accidentally set fire to his beard in the process.
Document 8: Ertuğrul Tekke Mosque: The Ertuğrul Tekke Mosque, (), is an Ottoman imperial mosque located in Yıldız neighbourhood, Serencebey rise of Beşiktaş district in Istanbul, Turkey. A late Ottoman period mosque, it is constructed as a külliye consisting of a tekke, guest house, türbe, fountain, and library in addition to the mosque.
Document 9: Karasjok (village): , , or is the administrative centre of Karasjok Municipality in Finnmark county, Norway. The village is located along both sides of the Karasjohka river, just west of the Norway-Finland border. The European route E06 highway runs through the village on its way from Lakselv to Tana bru and Kirkenes. The village has a population (2017) of 1,844 which gives the village a population density of .
Document 10: Nargedik, Karacasu: Nargedik is a village in the District of Karacasu, Aydın Province, Turkey. As of 2010 it had a population of 180 people.
Document 11: Aktaş, Ulus: Aktaş is a village in the District of Ulus, Bartın Province, Turkey. As of 2010, it had a population of 139 people.
Document 12: Karasu, Bartın: Karasu is a village in the District of Bartın, Bartın Province, Turkey. As of 2010, it had a population of 658 people.
Document 13: Qusarçay: Qusarçay (also, Kusarchay) is a village and municipality in the Khachmaz Rayon of Azerbaijan. It has a population of 4,776.
Document 14: Sultan Ahmed Mosque: The Sultan Ahmed Mosque or Sultan Ahmet Mosque (Turkish: Sultan Ahmet Camii) is a historic mosque located in Istanbul, Turkey. A popular tourist site, the Sultan Ahmed Mosque continues to function as a mosque today; men still kneel in prayer on the mosque's lush red carpet after the call to prayer. The Blue Mosque, as it is popularly known, was constructed between 1609 and 1616 during the rule of Ahmed I. Its Külliye contains Ahmed's tomb, a madrasah and a hospice. Hand - painted blue tiles adorn the mosque's interior walls, and at night the mosque is bathed in blue as lights frame the mosque's five main domes, six minarets and eight secondary domes. It sits next to the Hagia Sophia, another popular tourist site.
Document 15: Kasar, Çine: Kasar is a village in the District of Çine, Aydın Province, Turkey. As of 2010 it had a population of 362 people.
ground_truth: Istanbul
sub_queries: Karasu >> country Answer: Turkey
where is the blue mosque located in Turkey Answer: Istanbul