Pakistan to the Kamchatka peninsula in Russia, some 20,000 miles.

Don't believe me? Here's a video showing it on a globe in Google Earth.

[From twistedsifter.com/maps-that-will-help-you-make-sense-of-the-world]

Bonus map: This will help you get a better score at GeoGuessr: only the places highlighted in blue are covered by Street View, so only choose from there.