The “Seven Seas Mariner” will visit 48 UNESCO World Heritage sites along its five-month voyage.

Courtesy of Regent Seven Seas Cruises

Sure, 150 days at sea is a lot. But, oh the places you will see. On January 7, 2025, Regent Seven Seas Cruises will kick off the longest world cruise in the company’s 30-year history when the 684passenger Seven Seas Mariner sets sail on an epic journey to 25 countries across five continents over the course of 150 nights.

Along the way the itinerary will explore 97 ports of call, 48 UNESCO World Heritage sites, and cruise across 15 bodies of water, including 3 oceans.

“We know that our guests are looking for extended travel in exotic destinations,” Jason Montague, president and chief executive officer of Regent Seven Seas Cruises, said in a press release about the new round-the-world cruise offering. During the five months at sea, “travelers will . . . sail as far south as Antarctica, as far east as Asia and as far north as Alaska,” Montague noted.

The Historic City of Ayutthaya in Bangkok, Thailand, is among the dozens of UNESCO World Heritage sites passengers will visit.

Photo by lemaret pierrick/Shutterstock

The cruise will begin in Miami and will then venture to a handful of islands in the Caribbean, including Barbados and Dominica. From there it will head down the eastern coast of South America, stopping at multiple Brazilian ports, including Rio de Janeiro (and a visit to UNESCO World Heritage site Valongo Wharf Archaeological Site, a stone wharf dating back to the early 18oos where enslaved Africans arrived in Brazil), before heading due south for Antarctica.

After three days on the White Continent, the ship will stop in Ushuaia, Argentina, before working its way up the Chilean coast, making stops in Patagonia and at UNESCO World Heritage site Rapa Nui National Park, the Indigenous name for Easter Island.

From there, it will wind its way through the Pacific, visiting Robinson Crusoe Island (where Alexander Selkirk, the marooned sailor who inspired the classic novel Robinson Crusoe, lived from 1704 to 1709), Tahiti, and Bora Bora. Next up will be New Zealand, which includes hiking in UNESCO World Heritage site Tongariro National Park (mountains that hold cultural and religious significance for the Maori people) in Napier, followed by Australia, with an excursion to the Sydney Opera House, which also has a UNESCO designation as one of the architectural masterpieces of the 20th century.

The voyage continues onward to UNESCO sites that include Komodo National Park (known for the giant lizards of the same name) in Indonesia; the Botanic Gardens in Singapore; the Historic City of Ayutthaya in Bangkok, Thailand; and Ha Long Bay in Vietnam before popping into ports in China, South Korea, and Japan. Then it’s back across the international dateline to Alaska and Canada before the ship will finally work its way down to San Francisco.

There will also be three shoreside experiences exclusive to this sailing, including an equestrian exhibition and banquet in Buenos Aires, Argentina; a Māori kapa haka performance and meal in Auckland, New Zealand; and a visit to the Sanctuary of Truth pavilion, followed by a Thai folk dance and meal in Bangkok, Thailand.

One of the 684 suites on the “Seven Seas Mariner.”

Courtesy of Regent Seven Seas Cruises

Fares for the sailing start at $86,999 per guest for a Deluxe Veranda Suite. Should you really want to indulge, the Master Suite (with two bedrooms, two-and-a-half baths, a living room, two private balconies, a crystal chandelier, and a personal butler) is available at $249,999 per guest. Amenities for all fare classes include “first-class airfare, door-to-door luggage service, a comprehensive visa package, unlimited valet laundry including dry-cleaning and pressing, phone time per suite, onboard medical service, a commemorative gift, and more,” per the press release.

The Seven Seas Mariner is an all-suite, all balcony luxury vessel. On board guests will find four restaurants, a putting green, a pool, and spa and fitness center, among other amenities.

Tickets officially go on sale June 15, but eager travelers can pre-register their interest starting June 1 by calling by 1-844-4REGENT (1-844-873-2381) or through their travel advisor.

Oh, and if 150 nights at sea isn’t enough for you, there’s the option to tack on an additional 18 nights at the end of the sailing to see more of Mexico, Colombia, and the Panama Canal.

>>Next: The Best Around-the-World Cruises

Bailey Berg Bailey Berg is the associate travel news editor at AFAR, where she covers breaking news, trends, tips, sustainability, the outdoors, and more. When not interviewing sources or writing articles, she can be found exploring art galleries, visiting craft breweries, hiking with her dogs, and planning her next adventure (at present, she’s been to 75+ countries and hopes to spend time in every one someday).