Silversea Cruises will begin offering high-end land tours as a pre- and post-cruise option, starting in 2018.

The line's "Couture Collection" will feature private helicopter service in Mongolia, vintage rail in India, and Gulfstream jets in and out of Antarctica. Prices average $34,000 per guest for each five‐ to 11‐day adventure, with the 11‐day South Pole itinerary starting at $78,000 per guest.

The first offering, departing Jan. 2, is the "White Desert & South Pole" excursion that offers flights in and out of Antarctica on a Gulfstream business jet and a stay at Whichaway Camp. It can be combined with Silver Spirit's Dec. 18 voyage to Antarctica, Silversea.

Another excursion in the collection is the $45,199 "Revealing the Legends of Fire and Ice," a five-day trip in Iceland that includes kayaking, mountain biking, lunch atop a glacier-capped volcano and passage through a man-made ice tunnel, as well as a stay at Deplar, a sheep farm turned luxury lodge.

Departures on Aug. 2 or 8 can be combined with Silver Cloud expeditions departing July 27 or Aug. 8.

The least expensive of nine selections in the collection, the six-day "Namibia & Rovos Rail," includes a stay at the Little Kulala Camp in the Kulala Wilderness Reserve, a flight-seeing excursion, a hot-air balloon trip and a journey from Pretoria to Cape Town via the luxury Rovos Rail. Departures are listed for Jan. 8 or March 14 at $11,299, with connections to the Silver Spirit's Jan. 15 cruise or the Silver Cloud's March 21 trip.

"Our guests are seasoned luxury travelers looking to discover the least accessible corners of our planet, where nature can still astound with its untouched beauty," said Manfredi Lefebvre d'Ovidio, Silversea's executive chairman.

The Couture Collection itineraries were put together by Conrad Combrink, vice president of product development, expeditions and experiences.

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