As of 2009, how many lanes does an Olympic swimming pool have?

FINA or Fédération internationale de natation (English: International Swimming Federation) is the international federation recognized by the International Olympic Committee (IOC) for administering international competition in water sports. It is one of several international federations which administer a given sport/discipline for the IOC and/or international community. It is based in Lausanne, Switzerland.

An Olympic-size swimming pool is the type of swimming pool used in the Olympic Games, where the race course is 50 meters (164.0 ft) in length. This is typically referred to as "long course", distinguishing it from "short course" which applies to competitions in pools that are 25 meters (82.0 ft) in length. If touch panels are used in competition, then the distance between touch panels should be either 25 or 50 meters to qualify for FINA recognition. This means that Olympic pools are generally oversized, to accommodate touch panels used in competition. An Olympic-size swimming pool is used as a colloquial unit of volume, to make approximate comparisons to similarly sized objects or volumes. It is not a specific definition, as there is no official limit on the depth of an Olympic pool. The value has an order of magnitude of 1 megaliter (ML).

At FINA's 2009 Congress, rules were approved for 10-lane courses for competition, as an alternative to the more traditional 8-lane course.