Armutlu Peninsula density in the mountains at the inner peninsula is low, where there are only small villages. Both gulfs at the north and the south are actually on two active tectonic fault lines. The entire peninsula was hit by the İzmit earthquake on August 17, 1999 that occurred along the western portion of the North Anatolian Fault Zone. Armutlu Peninsula Armutlu Peninsula () is a peninsula extending westward into Marmara Sea in the Anatolian section of Turkey. In addition to Yalova Province, parts of Kocaeli Province and Bursa Province are on the peninsula. Armutlu Peninsula is between Gulf of Izmit in
Anatolian diagonal and land bridges intermittently formed across the Bosphorus and the Sea of Marmara. After the end of the most recent ice age, plants surviving to the west of the Anatolian diagonal could spread back into Europe while those to the east could spread into Syria, Iraq and the Near East. The Taurus Mountains provide a cool damp climate for species that cannot survive the hot dry summer climate on either side, and this could have encouraged survival and speciation, resulting in the many endemic species found here today. Anatolian diagonal The Anatolian diagonal is a theoretical dividing line which runs