Kalasyrta

Kocaeli Stadium is a stadium in İzmit, Turkey. It was opened to public in 2018 with a capacity of 34,712 spectators. It is the new home of Kocaelispor. It replaced the club's old home stadium, İzmit İsmetpaşa Stadium.

Köseköy railway station (Turkish: Köseköy istasyonu) is a railway station in Kartepe, Turkey, in the İzmit metropolitan area. TCDD Taşımacılık operates four daily regional trains between Istanbul and Adapazarı that stop at the station. The station was originally built in 1975 by the Turkish State Railways, when the Istanbul-Ankara railway was realigned to bypass İzmit's city center. The Köseköy Logistics Center is located adjacent to the station and is an important freight yard on the railway.Köseköy station was closed down on 1 February 2012 due to construction of the Ankara-Istanbul high-speed railway. The station was reopened in 2018.

Şehit Polis Recep Topaloğlu Sports Hall (Turkish: Şehit Polis Recep Topaloğlu Spor Salonu) is a multi-purpose indoor arena located in Izmit of Kocaeli Province, Turkey. The venue is used for competitions and trainings of a wide variety of sports branches including basketball, volleyball, handball, fencing, table tennis, wrestling, judo, karate, kick boxing and taekwondo. Opened officially on 6 August 2012, it has a seating capacity of 5,000.The sports hall is named in honor of Recep Topaloğlu, a swimming instructor as well as amateur footballer from İzmit, and member of the Police Special Operation Force, who was killed in action during a clash with Kurdish militants on Mount Judi in Şırnak Province, southeastern Anatolia on 21 March 2012.

Leptoia was an inland town of ancient Bithynia inhabited during Roman times. Its name does not occur in ancient authors, but is inferred from epigraphic and other evidence.Its site is tentatively located near İzmit in Asiatic Turkey.

Gökçeören (also Gökçeviran) is a neighbourhood of the municipality and district of İzmit, Kocaeli Province, Turkey. Its population is 455 (2022).

Cengiz Topel Naval Air Station (Turkish: Cengiz Topel Deniz Hava Üssü), a.k.a. Topel Airport or formerly Cengiz Topel Air Base, (IATA: KCO, ICAO: LTBQ) is a Turkish Navy air station located east of İzmit in Kocaeli Province, Turkey. The airport is in joint use for military and civil. Restructured in 1976, it hosts the Turkish Naval Aviation Command with two flying units, the 301st Squadron of fixed-wing aircraft and the 351st Squadron of rotorcrafts.The facility, formerly a base of the Turkish Air Force, is named after the Air Force fighter pilot Capt. Cengiz Topel, whose F-100 Super Sabre was shot down on August 8, 1964 during Turkey's military intervention in Cyprus. He ejected safely over land, but was promptly captured after landing and lynched by members of the Cyprus National Guard. He was the first Turkish pilot ever killed in action.

Kocaeli B.B. Ice Arena (Turkish: Kocaeli B.B. Olimpik Buz Sporları Salonu), formerly Kocaeli Ice Rink, is an indoor ice skating and ice hockey arena located at Şirintepe neighborhood of Izmit in Kocaeli Province, Turkey. It was opened in 1999 and has a seating capacity of 3,600 spectators.It was built according to International Ice Hockey Federation specifications, which are given in metric units (the Imperial units given are approximations): 61 m × 30 m (200 ft × 98 ft) with a corner radius of 8.5 m (28 ft). The arena is home to Kocaeli B.B. Kağıt Ice Hockey Men's team, which plays in the Turkish Ice Hockey Super League. Turkish Ice Hockey Women's League matches are also played in the arena, which hosts the women's ice hockey team of the same club.

Koubaita was an inland town of ancient Bithynia inhabited during Roman times. Its name does not occur in ancient authors, but is inferred from epigraphic and other evidence.Its site is located near Gündoğdu in Asiatic Turkey.

Kartepe is a municipality and district of Kocaeli Province, Turkey. Its area is 301 km2, and its population is 136,625 (2022). The mayor is Mustafa Kocaman (AKP).

Kırkikievler railway station (Turkish: Kırkikievler istasyonu) was a railway station in İzmit, Turkey. It was serviced by the Adapazarı Express regional train service from Istanbul to Adapazarı. Located just south of the city center, the station was originally built in 1975 by the Turkish State Railways, when the Istanbul-Ankara railway was realigned to bypass İzmit's city center.Kırkikievler station was closed down on 1 February 2012 due to construction of the Ankara-Istanbul high-speed railway.

Geragathe was an inland town of ancient Bithynia inhabited during Byzantine times.Its site is located north of İzmit in Asiatic Turkey.

İzmit (Turkish pronunciation: [ˈizmit]) is a municipality and the capital district of Kocaeli Province, Turkey. Its area is 480 km2, and its population is 376,056 (2022). The capital of Kocaeli Province, it is located at the Gulf of İzmit in the Sea of Marmara, about 100 km (62 mi) east of Istanbul, on the northwestern part of Anatolia. Kocaeli Province (including rural areas) had a population of 2,079,072 inhabitants in 2022, of whom approximately 1.2 million lived in the largely urban İzmit City metro area made up of Kartepe, Başiskele, Körfez, Gölcük, Derince and Sapanca (in Sakarya Province). Unlike other provinces in Turkey, apart from Istanbul, the whole province is included within the municipality of the metropolitan center. İzmit was known as Nicomedia (Greek: Νικομήδεια) and Ólbia (Greek: Ὀλβία) in antiquity, and was the eastern and most senior capital city of the Roman Empire between 286 and 324, during the Tetrarchy introduced by Diocletian. Following Constantine the Great's victory over co-emperor Licinius at the Battle of Chrysopolis in 324, Nicomedia served as an interim capital city for Constantine between 324 and 330, when he rebuilt and expanded the nearby city of Byzantium as the new Roman capital; formally dedicating it in 330 with the name Nova Roma, before he soon renamed it as Constantinopolis (modern Istanbul). Constantine died at a royal villa near Nicomedia in 337. During the Ottoman Empire, İzmit was the capital of the Sanjak of Kocaeli.