This island and its neighboring islet Marta is home to tens of thousands of Magellanic Penguins, cormorants, other birds and sea lions. Both islands make up the Monumento Natural Los Pingüinos (The Penguins Natural Monument), located 25 nautical miles north of Punta Arenas. The estimated population of the penguins on these two islands is more than 50,000 penguin pairs. The boat trip to Isla Madgdalena offers contrasting views to the west and east of the Strait. On the west coast can be seen the Tres Puentes area, the village of Río Seco and other small settlements along the shore. Industrial centers and oil production centers can be seen in the distance, such as Bahia Laredo and Cabo Negro. Toward the east, the coast of Tierra del Fuego looms flat and long. In front of Isla Magdalena can be seen the deep Bahía Gente Grande (Large People Bay), a name that was given to this bay by Pedro Sarmiento de Gamboa four centuries ago because of the tall stature of the indigenous Ona tribe.