What is the largest wingspan ever verified on a wandering albatross, in meters?

Answer

3.63 meters

That's wider than a small car is long. Wandering albatrosses can lock their wings in place and glide for hours without a single flap, sometimes circling the entire Southern Ocean in a year.

Source: Guinness World Records (largest wingspan for a living bird species, male caught in the Tasman Sea, 1965)