The two masses of elevated land just described are separated by a broad meadow, through which the stream of the Lycus flows athwart the promontory into the Sea of Marmora; and there is, moreover, a considerable extent of level land along the shores of the promontory, and in the valleys between the northern hills. Few of the hills of Constantinople were known by special names, and accordingly, as a convenient mode of reference, they are usually distinguished by numerals. The First Hill is the one nearest the promontory’s apex, having upon it the Seraglio, St. Irene, St. Sophia, and the Hippodrome. The Second Hill, divided from the First by the valley descending from St. Sophia to the Golden Horn, bears upon its summit the porphyry Column of Constantine the Great, popularly known as the Burnt Column and Tchemberli Tash. The Third Hill is separated from the preceding by the valley of the Grand Bazaar, and is marked by the War Office and adjacent Fire-Signal Tower, the Mosque of Sultan Bajazet, and the Mosque of Sultan Suleiman the Magnificent. The Fourth Hill stands farther back from the water than the five other hills beside the Golden Horn, and is parted from the Third Hill by the valley which descends from the aqueduct of Valens to the harbour. It is surmounted by the Mosque of Sultan Mehemet the Conqueror. The Fifth Hill is really a long precipitous spur of the Fourth Hill, protruding almost to the shore of the Golden Horn in the quarter of the Phanar. Its summit is crowned by the Mosque of Sultan Selim. Between it and the Third Hill spreads a broad plain, bounded by the Fourth Hill on the south, and the Golden Horn on the north. The Sixth Hill is divided from the Fifth by the valley which ascends southwards from the Golden Horn at Balat Kapoussi to the large Byzantine reservoir (Tchoukour Bostan), on the ridge that runs from the Mosque of Sultan Mehemet to the Gate of Adrianople. It is distinguished by the ruins of the Palace of the Porphyrogenitus (Tekfour Serai) and the quarter of Egri Kapou. Nicetas Choniates styles it the Hill of Blachernae (βουνὸς τῶν Βλαχερνῶν),[2] and upon it stood the famous Imperial residence of that name. The Seventh Hill, occupying the south-western angle of the city, was known, on account of its arid soil, as the Xerolophos—the Dry Hill.[3] Upon it are found Avret Bazaar, the pedestal of the Column of Arcadius, and the quarters of Alti Mermer and Psamathia. Here, then, was a situation where men could build a noble city in the midst of some of the fairest scenery on earth.