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 "Nikolai Albov"): He made his mark first as an explorer of the Caucasus, to which he made several extensive trips financed by the Swiss Botanist Society, and later, after having moved to Argentina in 1895, of the Southern regions of South America.
Relevant evidence: No