VRF map - what's the blue area?

I was flying to Tokyo and noticed in the VRF map an area surrounded with a blue border. What is this?

Controlled airspace boundary,
It should show you a min /max altitude for that area. Like SFC/3000 but the sim dose not.

Likly will be a city airport in the middle or an airbase

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It´s most probably a nature park near Shikama.
Some dams there and waterfalls.
See SkyVector and Google maps.

Thank you Sir!

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