Isla Martillo, also known as Isla Yécapasela, lies just 15 kilometres from Ushuaia in the Beagle Channel and is celebrated for its vibrant penguin colonies. Travellers can enjoy boat tours or guided walks to watch Magellanic penguins nesting in grasslands and Gentoo penguins tending their chicks, with occasional sightings of King and Rockhopper penguins. A notable feature is that Isla Martillo is the only accessible site in southern Argentina where multiple penguin species coexist, including the sole Gentoo breeding colony in South America. With limited visitor numbers and strict conservation rules, it offers a rare and unforgettable wildlife experience.