There is a foolproof indicator for telling whether someone is a billionaire: see if they own one of the world’s largest yachts

A report reviews the world’s largest private superyachts, their owners, specs and prices.

Among the featured vessels are Azzam and Eclipse, linked to Mohammed bin Zayed Al Nahyan and Roman Abramovich.

The story highlights their staggering upkeep costs and the role they play as symbols of extreme wealth.

Many of these megayachts spend the summer in the Mediterranean, with Spain as a frequent destination.