Jan Koum, the billionaire founder of WhatsApp, is enjoying a luxurious summer vacation in Croatia. His 100-metre superyacht, Moonrise, has been spotted anchored between the islands of Lopud and Šipan.

Koum, whose fortune is estimated at $13 billion, owes much of his wealth to the success of WhatsApp. His yacht, equipped with a jacuzzi and helipad, is valued at $200 million and can host 15 guests in 8 cabins, with 32 crew members on board.

In addition to his yacht, Koum owns a private jet and other luxury properties, ensuring he can travel and communicate with ease—often through WhatsApp, the app that made it all possible.