The world's largest private yacht cost $600 million to build and has held the record for more than 5 years 

The Azzam yacht docked in Casablanca, Morocco, in 2014.

 Shutterstock/Andy Ginn

• The largest motor yacht in the world is a staggering 590 feet long and cost $600 million to build.
• At its launch in 2013, the Azzam beat out Eclipse, the superyachtthat previously held the title of world's largest, by a full 57 feet.
• Azzam still holds its record more than five years later — but that might be about to change.

At 590 feet long, the Azzam is known to be the largest superyacht in the world.

Although there is no strict definition, a superyacht is generally understood to be a yacht that is at least 78 feet long, according to Warsash Superyacht Academy.

When it was launched in 2013, the yacht broke the record previously held by the Eclipse, a 533-foot yacht owned by Russian billionaireRoman Abramovich.

"[The Azzam] truly represents another milestone in not only our history, but yachting history as well," Lürssen Yachts managing partner, Peter Lürssen, said in a press release when the Azzam was launched.

Here's a look at the massive yacht.

The 590-foot yacht was finished in April 2013 and belongs to Sheikh Khalifa bin Zayed Al-Nahyan, president of the United Arab Emirates.

Courtesy of Lürssen Yachts

Source: CNBC

It dethroned Eclipse, the 533-foot superyacht owned by Russian billionaire Roman Abramovich, which previously held the record for largest yacht in the world.

Roman Abramovich's 533-foot yacht, Eclipse.

 Shutterstock/Agent Wolf

Source: Business Insider

The Azzam cost an estimated $600 million to build and was constructed over the course of four years.

Courtesy of Lürssen Yachts

Source: CNBC

It was built by Lürssen Yachts with exterior design by Nauta Yachts and interior design by French designer Christophe Leoni.

Courtesy of Lürssen Yachts

Source: Lürssen Yachts

A representative for Lürssen Yachts said the boat was "without a doubt the most challenging yacht that has ever been built."

Courtesy of Lürssen Yachts

Source: International Business Times

The Azzam can move quickly for its size. With its 94,000 horsepower, the boat has hit a speed of 31.5 knots, or about 37 miles per hour, which is believed to the fastest speed for a yacht longer than 300 feet.

Courtesy of Lürssen Yachts/Klaus Jordan

Source: CNBC

Although no interior photos have been made available, the boat is rumored to have a 6,000-square-foot lounge, up to 50 suites, and a 95-foot salon.

Courtesy of Lürssen Yachts/Giovanni Romero

Source: CNBC

But the Azzam might not hold its record for much longer. In 2017, a Norwegian billionaire ordered the construction of a high-tech yacht called the REV that is supposed to be 597 feet long, which would be longer than the Azzam by seven feet.

A rendering of the REV yacht.

 REV Ocean/Facebook