• M&M Charters Offers wilderness adventures in the Alaskan interior.

• MacDonalds Ranch Horseback riding stable and western adventure tour ranch located in the Sonoran Desert.

• Mackay Wilderness River Trips Complete guided whitewater rafting, floating, fishing, kayaking, and paddling trips on Idaho's Middle Fork and Main Salmon Rivers.

• Mackinac Island Carriage Tours Offering sightseeing tours and wedding carriages.

• Mactrek & Expedition Offers sightseeing, trekking, climbing, rafting, and jungle safari tours in Nepal and Tibet. Tours of Bhutan and Sikkim available.

• Mad Adventures Rafting tours for various skill levels on the Colorado, Clear Creek, and Arkansas rivers. Also, Jeep tours of the Arapaho forest.

• Mad River Boat Trips Offering half and full day trips on the Snake River.

• Mad-Dog Expeditions Offers challenging expeditions and training, including ice diving, for serious divers of all ability levels.

• Mad4adventure Features news, email addresses, insurance, gear, guides, and related information for adventure travelers.

• Madagascar Grace Tours Offers tours and hiking trips in Madagascar focusing on indigenous plants and animals.

• Madagascar Travel Offers a variety of birding, wildlife, and group tours throughout Madagascar.

• Madiba Sailing Vacations Offers catamaran sailing vacations and crewed yacht charters.

• Madubula Safaris Offers guided hunts for a variety of game in South Africa.

• Magallanes Travel Offering tours to Peru, Bolivia, and Ecuador's four regions: Andean Highlands, Western Lowlands, Amazon Rainforest, and the Galapagos Islands.

• Magamba African Safaris Personally guided wildlife and photography safaris in Botswana, Namibia, South Africa, Zambia, and Zimbabwe.

• Magic Falls Rafting Company Offering overnight trips on the Kennebec and Penobscot Gorges.

• Magic of the Orient Specialises in holidays throughout the Orient and the Far East, including Hong Kong, Singapore, Maldives, Bali, and Malaysia.

• Magic Safaris Offers several guided safari packages in Uganda.

• Magical Cusco Tours Provides specialized and group tours to Cusco, Machu Picchu, Lima, and other locations throughout Peru.

• Magnetic Island Rent-a-Yacht Offers bareboat yacht charters cruising islands in the Great Barrier Reef, including Palm and Magnetic Island groups.