ANTREC - Accommodation and activity listings from the Romanian National Association for Rural Tourism. Circumpolar Expeditions - Tour details and reservation form for travel above the Arctic circle in Russia. Ecotours Hungary - Details of a range of 1-9 day tours, with terms and conditions, and reservation form. Tengri - Ecological Association Tengri presents its philosophy, achievements, and tour itineraries in the Southern Urals. Toumba - Offers guided biking, hiking, and horse riding tours, and accommodations in exchange for volunteer farm work in the Greek village of Milies. Nature Travels - UK-based company specializing in responsible outdoor and wildlife holidays, including dog sledding and canoeing, in the Nordic countries. Details, itineraries and booking. Barefoot Adventure Travel in Romania - Offers canoeing, hiking, and cultural tours in the Danube Delta. Includes travel tips, location details and booking information. Mandala Organic Tours - Offers farm holidays, biking, hiking, nature and culture tours, and whale watching in Sicily.