Kiel (/kiːl/ KEEL, .mw-parser-output .IPA-label-small{font-size:85%}.mw-parser-output .references .IPA-label-small,.mw-parser-output .infobox .IPA-label-small,.mw-parser-output .navbox .IPA-label-small{font-size:100%}German: [kiːl] ⓘ) is the capital and most populous city in the northern German state of Schleswig-Holstein, with a population of 246,243 (2021). Kiel lies approximately 90 kilometres (56 mi) north of Hamburg, and about the same distance south of the Danish border. Due to its geographic location in the southeast of the Jutland peninsula on the southwestern shore of the Baltic Sea, Kiel has become one of Germany's major maritime centres, known for a variety of international sailing events, including the annual Kiel Week, which is the biggest sailing event in the world. Kiel is also known for the Kiel Mutiny, when sailors refused orders to prepare to engage the British Navy in the last weeks of World War I, sparking the German Revolution which led to the abdication of the Kaiser and the formation of the Weimar Republic. The Olympic sailing competitions of the 1936 and the 1972 Summer Olympics were held in the Bay of Kiel.[4] Kiel has also been one of the traditional homes of the German Navy's Baltic fleet, and continues to be a major high-tech shipbuilding centre. Located in Kiel is the GEOMAR – Helmholtz Centre for Ocean Research Kiel at the University of Kiel, that was founded in 1665. Kiel is an important sea transport hub, thanks to its location on the Kiel Fjord (Kieler Förde) and the busiest artificial waterway in the world,[5] Kiel Canal (Nord-Ostsee-Kanal). A number of passenger ferries to Sweden, Norway, Lithuania and other countries operate from here. Moreover, today Port of Kiel is a popular destination for cruise ships touring the Baltic Sea.