660km

660 kilometers (symbol 660 km) are a unit of length in the metric system. One kilometer equals 1,000 meters, so 660 kilometers equal 660,000 meters.

In other common units, 660 kilometers is about 410 statute miles and roughly 356 nautical miles.

The prefix kilo- denotes a factor of one thousand, and the kilometer is the standard unit for measuring long distances on land and in aviation. In practical terms, 660 km is the distance between many cities and regions and is often used to describe travel distances, road routes, or flight paths.

At a constant speed of 110 km/h, the travel time to cover 660 km would be about six hours; at 60 km/h, it would take roughly 11 hours. These estimates exclude stops, variations in speed, and other real-world factors.

There is no widely recognized event or standard specifically associated with 660 km. It serves primarily as a numerical distance used in geography, transportation planning, and education to illustrate units, conversions, and scale.