Isla Martillo
Isla Martillo is a small island in the Beagle Channel accessible by excursion from Ushuaia, renowned for its mixed colony of Magellanic and Chinstrap penguins observable just meters away, from October to March.
Isla Martillo is a small island in the Beagle Channel, east of Ushuaia, accessible only by guided boat excursion. Its reputation rests on one thing: a mixed colony of Magellanic and Chinstrap penguins observable just meters away. There are no tourist facilities on the island—just the birds, the wind, and the subantarctic steppe.
Practical information at a glance
- Access: boat excursion from Ushuaia's port or from Estancia Harberton—no independent access.
- Landing: some tours include disembarkation for a walking tour on the island; others remain in observation from the boat.
- Season: colony present from October to March approximately (breeding and chick-rearing season).
- Recommended duration: plan for a half-day excursion from Ushuaia, including maritime travel.
- Rules: minimum distances required with penguins; local guides strictly supervise groups.
- Accessibility for persons with reduced mobility: natural, unimproved terrain with difficult access.
What you'll see
The colony numbers several thousand breeding pairs. Magellanic penguins dig burrows in low vegetation; Chinstrap penguins, larger, occupy open areas. At peak season, gray chicks mingle with fully-feathered adults. The surrounding landscape—snow-capped mountains, dark Beagle Channel waters—enhances the site's singular character.
History and context
The island falls administratively under Estancia Harberton, Tierra del Fuego's oldest estancia, founded in 1886 by British missionary Thomas Bridges. Harberton today manages landing permits on Isla Martillo in partnership with authorized maritime operators. This private management has limited visitor numbers and preserved the colony.
Highlights of the visit
Walking among the penguins
On excursions with landings, you follow marked trails just meters from nesting sites. The penguins, unafraid, go about their business undisturbed by visitors. Avoid crouching abruptly or blocking their path to the sea.
Observation from the boat
Tours without landing allow you to cruise slowly past the island. You may also spot cormorants, skuas, and—with luck—Commerson's dolphins in the channel.
Crossing the Beagle Channel
The journey itself is an experience: the Beagle Channel, navigated by Darwin in 1833, offers views of the Darwin Cordillera peaks on the Chilean side and forested hills of Argentine Tierra del Fuego.
Photography tips
Subantarctic light is soft and lateral much of the day, ideal for wildlife portraits. Favor morning excursions to avoid midday glare. A moderate telephoto lens (70-200 mm) suffices: penguins are close by. Avoid flash, which disturbs the birds.
Location and access
Isla Martillo sits in the Beagle Channel, roughly 85 km east of Ushuaia by sea. The most common departure point is Ushuaia's tourist port. Some operators offer a combined route: by road to Estancia Harberton, then by boat to the island—allowing you to visit the historic estancia in the same day.
Nearby attractions
- Estancia Harberton — Tierra del Fuego's oldest estancia, with a marine wildlife museum and historic wooden buildings.
- Beagle Channel — legendary waterway between Argentina and Chile, dotted with glaciers, islets, and marine wildlife.
- Tierra del Fuego National Park — southern beech forests, peatlands, and hiking trails west of Ushuaia.
- Ushuaia — world's southernmost city, departure point for Antarctic cruises and regional logistics hub.
Frequently asked questions
The colony is present from October to March. November-December corresponds to egg-laying and hatching; January-February, chicks are clearly visible. Outside this period, the island is empty.
No. Access is restricted to organized excursions by operators authorized by Estancia Harberton. There is no public transport or private boat rental for this site.
With landing, you walk on the island among penguins on a marked trail. Without landing, you observe from the boat while passing along the shore. The first is more immersive but subject to weather conditions and visitor quotas.
Plan for a complete half-day. Maritime crossing is lengthy; combined packages with Estancia Harberton can occupy a full day.
Yes, photography is permitted. Flash is discouraged. You must stay on marked trails and not approach closer than the distance indicated by your guide.
Wind and cold are constant, even in southern summer. Wear layered clothing, a waterproof windbreaker, and closed hiking shoes. The terrain is grassy and sometimes muddy.
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