Suez Canal Authority
Vessels longer than 400 meters need permission from the Suez Canal Authority to transit the canal. As of 2020, the largest container ships in service all have a length of (close to) 400 meters, and a beam and draft that fit just within the limits of the canal. The ship Ever Given, which ran aground in the Suez Canal in 2021, has Suezmax size with 399.9 meters length and 58.8 meters beam.