123 km

123 km represents a distance of one hundred and twenty-three kilometers. A kilometer (km) is a unit of length in the metric system, equivalent to one thousand meters. It is commonly used for measuring geographical distances, road lengths, and other relatively long distances. The "km" abbreviation is universally recognized and employed in scientific, engineering, and everyday contexts worldwide, particularly in countries that have adopted the metric system. 123 km equates to approximately 76.43 miles.