what’s the farthest to each direction you’ve ever been? N: Gullfoss, Iceland S: Oban, Stewart Island (Rakiura), New Zealand E: Djurgården, Stockholm, Sweden W: Yìngchéng, Xiàogǎn, Húběi, China (excluding air travel, and a transfer at HEL)

How is E and W defined here?

In my case, since I have done round the world trips, it's defined by the largest E-W gap in places I've been on land.

So Stockholm is E because you flew east to get there?

I flew west to get to Stockholm, but also left it going west. The last ~week of my life in which there were longitudes I hadn't flown through, the gap in longitudes was Berlin-Stockholm. Stockholm is E because there's a 95 degree gap between the E and W points, my largest gap.