The explanation appears after you choose the correct answer.
ここはどこ?
The sign in the back-right is written in hiragana! The arrow sign—called a “fixed snow guide post”—only appears in snowy regions, narrowing this down to places like Hokkaido.
Besides place names, you can narrow down the region within Japan using clues such as area codes and utility poles. A well-known community resource packed with hints is plonk it—make sure to read it first.
