Seabourn has mapped out its 2029 World Cruise, and it leans hard into islands most travellers only ever see on a map. The 138-day sailing, running from 9 January to 26 May 2029, departs Miami and covers more than 32,000 nautical miles across 58 ports in 31 countries and territories, ending in Europe after swings through the South Pacific, Australasia, Southeast Asia, the Indian Ocean and Africa.

The headline draw is UNESCO-heavy: the route takes in more than 25 World Heritage sites, including Easter Island, Stone Town in Zanzibar, Fiordland National Park in New Zealand and the Sacred City of Kandy in Sri Lanka. But Seabourn has also paired the big names with places large cruise ships rarely reach — Praslin in the Seychelles with its Coco de Mer palms, Nuku Hiva in the Marquesas, and Antsiranana in northern Madagascar. The line points out that its ships are small enough to sail waters closed to mega-vessels, which is what makes several of these stops possible.

Pacing gets some thought too. There are extended stays in Cartagena, Melbourne, Portland and Victoria (Seychelles), plus eight overnight calls including Lima, Singapore and Bali. Those longer stops double as launch pads for side trips — the Galápagos, Machu Picchu, or an African safari — if you want to fold a land adventure into the voyage.

Your home for those 138 days is the Seabourn Quest, a 650-foot ship capped at 458 guests, all in oceanfront suites. Onboard programming ties into the route: destination-focused culinary events, cultural performances and entertainment. Seabourn president Mark Tamis pitched the trip as combining celebrated destinations with remote corners of the world for "deeper discovery" — marketing language, sure, but the itinerary does back it up.

If four-plus months at sea sounds like too much of a good thing, Seabourn will also sell segments of the voyage as shorter extended voyages, though some perks are reserved for full-cruise guests. Booking is open now via Seabourn's website or phone line. Anyone seriously considering it should move early — full world cruises on small luxury ships tend to sell out years ahead, and 2029 is no exception.