The FINA World Masters Championships began in Tokyo, Japan in 1986 and continued in even-numbered years until the 2014 Montreal Championships. Since then, the Masters competition has been held at the same place and shortly after the (Elite) FINA World Championships.
This year, the Championships are being held in Gwangju, South Korea. The swimming competition runs from August 12th to 18th.
All information about registration, visa procedures, schedule, qualifying times, etc. can be found on the Official Championship Website.