   to help compare different orders of magnitude this page lists lengths between 10 and 100 kilometres (104 to 105 metres). the myriametre (10,000 metres) is a deprecated unit name; the prefix myria- is obsolete, not included among the prefixes when the international system of units was introduced in 1960. distances shorter than 10 kilometres ==conversions== 10 kilometres is equal to: * 10,000 metres * 6.2 miles * 1 mil, unit of measure commonly used in norway and swedenhaugen, einar, norwegian english dictionary, 1965, oslo: universitetsforlaget and madison: university of wisconsin press, s.v. mil *  *  ==sports== * 42.195&nbsp;kmkm is an abbreviation of kilometre &mdash; length of the marathon ==human-defined scales and structures== * 18&nbsp;km &mdash; cruising altitude of concorde * 27&nbsp;km &mdash; circumference of the large hadron collider,  the largest and highest energy particle accelerator *  *  * 34.668&nbsp;km &mdash; highest manned balloon flight (malcolm d. ross and victor e. prather on may 4, 1961)  * 38.422&nbsp;km &mdash; length of the second lake pontchartrain causeway in louisiana, us * 39&nbsp;km &mdash; undersea portion of the channel tunnel * 53.9&nbsp;km &mdash; length of the seikan tunnel, , the longest rail tunnel in the world.{{cite web |title=turkey building the world's deepest immersed tube tunnel|url=http://www.popularmechanics.com/technology/engineering/4217338 |first=jeff |last=wise |work=popular mechanics |date=october 1, 2009 |accessdate=january 2011
Orders_of_magnitude_(length)