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 beyliks Madrassa" in Niğde (1409), all of which respect a new style that considers and incorporates the exterior surroundings also. One of the first examples of the Anatolian beylik architecture hinting at the forming of the Ottoman architecture that aims at uniting the interior space beneath one big dome and forming a monumental architectural structure is "Ulucami Mosque" in Manisa (1374) built by the Saruhan beylik. Also worth noting is the increase in constructions of madrassas that points at the beyliks' attaching greater importance to sciences. Anatolian beyliks Anatolian beyliks (, Ottoman Turkish: "Tavâif-i mülûk", "Beylik" ), sometimes known as Turkmen