Istanbul in the 1970s, as people from Anatolia migrated to the city to find employment in the many new factories that were built on the outskirts of the sprawling metropolis. This sudden, sharp rise in the city's population caused a large demand for housing, and many previously outlying villages and forests became engulfed into the metropolitan area of Istanbul. Istanbul is located in north-western Turkey within the Marmara Region on a total area of . The Bosphorus, which connects the Sea of Marmara to the Black Sea, divides the city into a European, Thracian side—comprising the historic and economic centers—and an
Strait of Tartary empires. Since the Manchus' rise to prominence in 1644, the name "Tartars" became applied to them as well, and Manchuria (and Mongolia) became known to the Europeans as the "Chinese Tartary". Accordingly, when La Pérouse charted most of the strait between Sakhalin and the mainland "Chinese Tartary" in 1787, the body of water received the name of the Strait (or Channel, or Gulf) of Tartary. In Japan, the strait is named after Mamiya Rinzō, who traveled to the strait in 1808 whereof the name was introduced by Philipp Franz von Siebold in his book "Nippon: Archiv zur Beschreibung von Japan"