<P> The eastern opening is a wide bay on the border of Chile and Argentina between Punta Dúngeness on the mainland and Cabo del Espíritu Santo ( Cape of the Holy Spirit ) on Tierra del Fuego , the border as defined in the Treaty of Peace and Friendship of 1984 between Chile and Argentina . Immediately west are Primera Angostura and Segunda Angostura , narrows formed by two terminal moraines of different ages . The Primera Angostura is the closest approach of Isla Grande de Tierra del Fuego to the mainland of South America . Farther west lies Magdalena Island , part of Los Pingüinos Natural Monument . The strait 's southern boundary in the east follows first the shoreline of the Isla Grande de Tierra del Fuego , then the northern end of the Canal Whiteside and the shoreline of Dawson Island . </P>
where is the strait of magellan located on a map
on the border of Chile and Argentina between Punta Dúngeness on the mainland and Cabo del Espíritu Santo