Question:  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?         
Sentence (from "Tierra del Fuego"): The archipelago consists of the main island, Isla Grande de Tierra del Fuego, with an area of 48100 km2 , and a group of many islands, including Cape Horn and Diego Ramírez Islands.
Relevant evidence: No