A short-course lap pool is 25 meters long, and a long-course lap pool is 50 meters long under American and international standards. Many recreational lap pools across the country meet one of these two standards, although pools of various lengths can be found.
Both short-course and long-course lap pools are used in national and international swimming competitions. Long-course lap pools are commonly known as Olympic-size swimming pools since they are the standard pool size used in Olympic competitions and other world championship events. USA Swimming, the national governing body that oversees the sport of swimming in the United States, maintains a comprehensive list of certified competition pools, which includes locations in all 50 states.