 Nikolai Mikhaylovich Albov is credited with being the first European explorer to have traveled extensively over an archipelago off the southernmost tip of the South American mainland across what strait?         
Nikolai Albov: Nikolai Mikhaylovich Albov (Russian: Николай Михайлович Альбов , 15 October 1866 — 6 December 1897, La Plata, Argentina) was a Russian botanist and geographer. Nikolai Albov:  He is credited with being arguably the first European explorer to have traveled extensively over Patagonia and Tierra del Fuego and (writing in Russian and French), described its flora. Tierra del Fuego: Tierra del Fuego ( , ] ; Spanish for "Land of Fire") is an archipelago off the southernmost tip of the South American mainland, across the Strait of Magellan.
Strait of Magellan