TIL In South Korea the island of Yeouido, which contains Seoul’s main finance and media districts, is often used by South Korean media as a means of comparison for measuring an unfamiliar area.

https://en.wikipedia.org/wiki/Yeouido
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https://www.reddit.com/r/todayilearned/comments/1gky6qd/til_in_south_korea_the_island_of_yeouido_which/