Owners of these superyachts, the ultra-rich, prize confidentiality above all else while purchasing these massive and most expensive vessels. That is the reason why it is a challenge to establish a definitive list of the largest yachts in the world.

Here are the top 20 largest superyachts in the world.

20) Issham Al Baher Yacht – 379ft (115m)

Formerly known as Atlantis, this awesome vessel was built in 1973. The name changed with the change of ownership. This 379 feet superyacht can easily carry a crew of up to 17.

19) Atlantis II – 380ft (115.8m)

Atlantis II was built in the year 1981 by Hellenic Shipyards. This 380 feet superyacht was built for the Greek shipping magnate Stavros Niarchos.

18) Turama – 383ft (117m)

This 383 feet superyacht was built in 2004 by Finnish shipyard Rauma. It is a powerful welded steel vessel known for its detailing like extensive teak decking. You get a homely feel when you step into this superyacht.

17) A – 390ft (119m)

Unconventional superyacht A was designed by Philippe Starck. It has an unusual upside down hull and distinctive silhouette. It was built in 2008 by Blohm + Voss. This 390 feet superyacht is one of the finest vessels in the world.

16) Alexander – 400ft (122m)

Alexander has a steel hull and superstructure. This 400 feet luxury motor superyacht was built and designed in 1965 by German firm Lubecker Flender Werke. It is famous for its classic design. It can accommodate up to 80 people.