Ankara (; ; historically known by the names Ancyra and Angora) is the capital of Turkey and the country’s second largest city, Istanbul being the largest. The city has a mean elevation of and in 2014 had a population of 5,150,072, with its metropolitan municipality having 4,965,542. It is the center of the Turkish Government, and an important commercial and industrial city. Located in Central Anatolia, Ankara is an important crossroads of trade, strategically located at the center of Turkey’s highway and railway networks, and serves as the marketing center for the surrounding agricultural area. The city is traditionally famed for its long-haired Angora goat and its prized wool (mohair), a unique breed of cat (Angora cat), Angora rabbits and their prized Angora wool, pears, honey, and the region’s muscat grapes. The historical center of Ankara is situated upon a rocky hill, which rises above the plain on the left bank of the Ankara Çayı, a tributary of the Sakarya (Sangarius) river. Although situated in one of the driest places of Turkey and surrounded mostly by steppe vegetation except for the forested areas on the southern periphery, Ankara can be considered a green city in terms of green areas per inhabitant, which is 72 m2 per head. Ankara is a very old city with various Hittite, Phrygian, Hellenistic, Roman, Byzantine, and Ottoman archaeological sites. The hill which overlooks the city is crowned by the ruins of the old castle, which adds to the picturesqueness of the view, but only a few historic structures surrounding the old citadel have survived to the present day. There are, however, many well-preserved remains of Ottoman and Roman architecture, the most remarkable being the Temple of Augustus and Rome (20 BC) which is also known as the Monumentum Ancyranum.