(1862) From the 1st century AD till the 7th century,
Baku bay was dry and the islands in the bay joined the land. In
Ptolemy’s map, Baku was described far from the sea. After the 7th century, the water level of the
Caspian Sea rose until the 9th century and since then, the formation of Baku bay began. Severe changes happened at the end of the 8th century, when the Caspian Sea rose more than ten meters. A major earthquake occurred in 1306, the
Sabayil Castle, built on an island in the Bay of Baku, was submerged and remained underwater for several centuries. It was only in the early 18th century, when the Caspian Sea retreated, that the island resurfaced. Mario Sanuto, an Italian geographer of the 14th century sadly noted that: "Water level of the Caspian Sea rises each year and most cities have flooded.", and according to words of Abd ar-Rashid al-Bakuvi, the geographer, in 1403 the Caspian Sea flooded the part of Baku and water stood near a mosque. At that time the sea was waving near the foot of the
Maiden Tower, which confirms a legend about a girl, who threw herself from the top of the tower. At that time
Sabayil Castle, which was built on the rock in Baku bay, was totally located underwater. During the next 600 years, the level of the sea was hesitatingly stood high till the beginning of the 20th century when it began to sink. ==Ecologic condition==