First mentioned in "A Game of Thrones", the city of Qarth has not yet appeared on any maps in the books. However, the HBO "Viewer's Guide" world map and the opening titles of the TV series' second season show Qarth located at a strait between the Summer Sea and the Jade Sea in the south-east of Essos. Upon Daenerys' first visit to Qarth in "A Clash of Kings", the warlock Pyat Pree describes his city as the center of the world and as a gateway of commerce and culture between the east and west, and the north and south. The reader learns through Daenerys's eyes that the city is surrounded by three graded walls of thirty to fifty feet in height, respectively engraved with portraits of animals, war, and lovemaking. The city's buildings are of many colors, including rose, violet, and umber. Slender towers rise throughout the city, fountains adorn every square, and thousands of colored birds, blooming trees and flowers fill the city. The TV adaptation filmed Qarth on the island of Lokrum near Dubrovnik and constructed a set at the Dubac quarry in Croatia to double for the gates of Qarth.