Argentina, with its infinite variety of landscapes and geographic zones, provides plenty of opportunities for those who like to take on nature up close and on foot. Northern Argentina offers unique desert landscapes, lush subtropical rainforest and of course the thunderous Iguazu Falls, on the border with Brazil. To the south, trekkers are greeted with the awe-inspiring scenery of Patagonia and Tierra del Fuego. The Valdes Peninsula is also a popular location, providing visitors with the chance to see penguins, sea lions, whales and abundant birdlife in the wild. Some treks give visitors the opportunity to follow ancient Inca trails. Treks are often combined with cruises through colourful port towns, verdant fjords, and rugged, glacier-topped mountains. A particularly good trekking-and-cruise combination is one that includes the Beagle Channel, including a visit to the Cape Horn National Park. The natural beauty of Argentina offers some of the best trekking in the world and numerous tour operators organise expeditions throughout the country. For the most part, qualified guides are part of the package and operators are uneasy letting tourists trek on their own. Although almost all treks are planned and run during the summer months, there are some spectacular winter-time trails that allow you to see the country in a starkly beautiful state.