1999 İzmit earthquake

İzmit İsmetpaşa Stadium (Turkish: İzmit İsmetpaşa Stadyumu) was a multi-purpose stadium in the Derince district of İzmit in Kocaeli Province, Turkey. It was named after the Turkish general and statesman İsmet İnönü (1884–1973), widely known as İsmet Pasha. Built in 1972, it was situated on the Istanbul-İzmit highway D.100. The stadium held 15,462 spectators, and was primarily used for football matches as the home stadium of Kocaelispor.

Arbeila was a town of ancient Bithynia on the coast of the Sinus Astacenus west of Nicomedia. Its name does not appear in ancient authors but is inferred from epigraphic and other evidence.Its site is located near Tuzla, in Asiatic Turkey.

Diolkides was a town of ancient Bithynia. Its site is located opposite Zeytin Burnu, Gölcük, in Asiatic Turkey.

Ford Otomotiv Sanayi A.Ş. (Turkish for 'Ford Automotive Industry'), doing business as Ford Otosan, is an automotive manufacturing company based in Turkey that is equally owned by Ford Motor Company and Koç Holding. The company was established in its current form in 1977, with original relations dating back to 1928. It currently operates in six locations: Gölcük and Yeniköy plants in Kocaeli, İnönü plant in Eskişehir, Craiova plant in Romania, Sancaktepe R&D Center and spare parts warehouse in Istanbul The company employs more than 20,000 people and had a production capacity of over 700,000 vehicles, 400,000 engines, and 140,000 powertrains by 2022.

Derince railway station (Turkish: Derince istasyonu) is a railway station in Hereke, Turkey. TCDD Taşımacılık operates four daily regional trains between Istanbul and Adapazarı that stop at the station. The station was originally built in 1904 by the Ottoman Anatolian Railway along with the Port of Derince.Derince station was closed down on 1 February 2012 due to construction of the Ankara-Istanbul high-speed railway. The station was reopened on 4 August 2017.

USS PC-1640 was an PC-1638-class submarine chaser in the United States Navy during the Cold War. She was transferred to the Turkish Navy as TCG Yarhisar (P 113) of the Hisar-class patrol boat.

Gölcük Barbaros Hayrettin High School (Turkish: Gölcük Barbaros Hayrettin Lisesi), is a public high school in Gölcük, Kocaeli, Turkey. The school is named after Ottoman admiral Hayreddin Barbarossa. Short form of the school name is GBHL. Formed in 1958 as "Gölcük Lisesi" (GL), the high school named as "Barbaros Hayrettin Lisesi" in 1970 when it moved to its own building from the provisional location. The colors of the school are black (symbolizing the deadly ferry accident on 1 March 1958 in which hundreds of high school students died in Gulf of İzmit) and yellow (symbolizing the sun/GBHL rising after this disaster). In the devastating earthquake epicentered in Gölcük on 17 August 1999, GBHL lost many of its students and faculty residing in Gölcük and surrounding towns. The buildings of the high school has been damaged, however later been repaired by the efforts of its alumni association and some international relief organizations.

Derince is a seaport, municipality and district of Kocaeli Province, Turkey. Its area is 198 km2, and its population is 146,374 (2022). The mayor is Zeki Aygün (AK Parti). Derince Port is one of the few ports in Turkey under government control. The port is operated by the Turkish State Railways (TCDD). Having one of the biggest storage area in the region, the port is widely used for finished vehicle product transportation. Derince is one of the few ports with railway connection in that area, and has the longest rail network within the port. Two rail ferry services use Derince Port, Tekirdağ-Derince operated by TCDD and Derince-Chornomorsk/Poti operated by Bati Wagon. The port is in the privatization list of Privatization Administration. The privatization process had restarted in October 2013. Six companies had offered for Derince Port, but the tender process was cancelled when none of them continued in the public auction.

The Korutepe Tunnel (Turkish: Korutepe Tüneli), is a motorway tunnel constructed on the Istanbul–Ankara motorway O-4 E80 in Kocaeli Province, northwestern Turkey. It is situated on the Korutepe Hill west of İzmit. The 1,028–1,088-metre (3,373–3,570 ft) long twin-tube tunnel carries two lanes of traffic in each direction. The Gültepe Tunnel follows it in the west direction. The tunnel was constructed in the 1980s. During the 1999 İzmit earthquake, the tunnel was light damaged. In 2012, the tunnel's both tubes were reinforced. In the time period of 2013–2014, the tunnel was modernized for traffic safety. Around 55,000 vehicles pass through the tunnel in both directions daily.

Kocaeli Bayan Futbol Kulübü, shortly Kocaeli Bayan FK, is a Turkish sole women's football sports club, based in İzmit city of Kocaeli. It was founded by Hasan Alemdaroğlu in 2016. Currently, they play in the Turkish Women's Second Football League. The club colors are green and black.The team finished the 2018–19 Women's Second League as runners-up, and was promoted to the Turkish Women's First Football League.

Gölcük, formerly known as Diolkides, is a municipality and district of Kocaeli Province, Turkey. Its area is 217 km2, and its population is 175,940 (2022). The city is located at the northern gulf of Armutlu Peninsula on the coast of Gulf of İzmit, a branch of the Sea of Marmara, in the south of the province. It is the district, where the 1999 earthquake disaster happened. Gölcük is the location of one of the Turkish Navy's main naval bases, and of a Ford Otosan automobile plant. The mayor is Ali Yıldırım Sezer (AKP).

The Gültepe Tunnel (Turkish: Gültepe Tüneli), is a motorway tunnel constructed on the Istanbul–Ankara motorway O-4 E80 in Kocaeli Province, northwestern Turkey. It was opened to traffic in 1984. It is situated on the Gültepe Hill west of İzmit. The 639–584-metre (2,096–1,916 ft) long twin-tube tunnel carries two lanes of traffic in each direction. The tunnel was constructed in the 1980s. During the 1999 İzmit earthquake, the tunnel was light damaged. In 2012, the tunnel's both tubes were reinforced. In the time period of 2013–2014, the tunnel was modernized for traffic safety. Around 55,000 vehicles pass through the tunnel in both directions daily.