Helenopolis or Drepana (Δρέπανα) was an ancient Greco-Roman and Byzantine town and bishopric in Bithynia, Asia Minor, on the southern side of the Gulf of Astacus. It has been identified with the modern village of Hersek, in the district of Altınova, Yalova Province. It is traditionally considered as the birthplace of Saint Helena.
Subaşı is a belde (town) in Altınova district of Yalova Province, Turkey. Situated at 40°42′N29°30′E it is close to Hersek Headland of Marmara Sea and has almost merged to Altınova to the east. The distance to Yalova is 12 kilometres (7.5 mi). The population of Subaşı is 5459 as of 2010. The name of the village refers to subaşı, a title in the Ottoman bureaucracy and the residents of the town are mostly Turkish migrants who were expelled from Bulgaria in 1935. The settlement was declared a seat of township in 1992. But it suffered severely in the 7.6 magnitude 1999 İzmit earthquake.
Koru is a belde (town) in Çınarcık district of Yalova Province, Turkey. Situated at 40°39′N29°10′E it is between Çınarcık to west and Yalova to east, all coastal places on the Anatolian side of Marmara Sea. Distance to ÇInarcık is 5 kilometres (3.1 mi) and to Yalova is 9 kilometres (5.6 mi). The population of Koru is 5257. as of 2010. Up to 20th century the population was composed of Greeks. The name of the settlement was Kuri. After the Population exchange between Greece and Turkey agreement, the former population of the settlement was replaced by the Turks from Serres and Drama in 1924. Former name was changed to a Turkish name with a similar sound and meaning small forest quite suitable for Koru. In 1992, the settlement was declared a seat of township. In 1999 the town suffered from the Great earthquake. Now the town is flourisahing as a center of floricıulture. Many agricultural crops are also produced.
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.
Kaytazdere is a small belde (town) in Altınova district of Yalova Province, Turkey. At 40°41′N29°32′E it is almost merged to Altınova. Distance to Yalova is 25 kilometres (16 mi). The population of Kaytazdereis is 5278 as of 2010. The settlement was founded at the end of the second Balkan War by Turkish refugees from Bulgaria. After the second World War an airbase was established around Kaytazdere. The economy of the town depends on small industries and agriculture.
Tavşanlı is a belde (town) in Altınova district of Yalova Province, Turkey. At 40°40′N29°27′E it is situated in the northern portion of Armutlu Peninsula. The distance to Altınova is 5 kilometres (3.1 mi) and to Yalova is 14 kilometres (8.7 mi). The population of Tavşanlı is 2586 as of 2010. The ferry dock is only 3.5 kilometres (2.2 mi) to Tavşanlı and the picnik places around the town can easily by reached in daily tours from İstanbul. Fruit and vegetable farming as well as floriculture are the main sources of revenue of the town.
Taşköprü is a coastal town in Çiftlikköy district of Yalova Province, Turkey. Taşköprü is situated on a peninsula at 40°41′N29°24′E. It is 6 kilometres (3.7 mi) from Çiftlikköy on the Turkish state highway . The population of Taşköprü is 3237 as of 2011. Taşköprü was founded by a group of Turkish families from Bulgaria in 1902. The name of the settlement refers to a 400-year-old Ottoman bridge at the east of the town.
Altınova is a town and district of Yalova Province, Turkey.
The 1894 Istanbul earthquake occurred in the Çınarcık basin or Gulf of Izmit in the Sea of Marmara on 10 July at 12:24pm. The earthquake had an estimated Ms magnitude of 7.0. At least an estimated 1,349 people were killed in towns around the Gulf of Izmit such as Yalova, Sapanca and Adapazarı, and in the nearby city of Istanbul. The main shock caused a tsunami 1.5 metres (4.9 ft) high.
