Shinanodaira was a ski area located on the eastern slopes of Kuroiwayama and to the north of central Iiyama City in the northern region of Nagano Prefecture.

It was originally known as Kuroiwa and experienced a few different ski lift set ups during the years of operation before closing in 2001.

More information and photos here:

https://www.snowjapanhistory.com/nagano-iiyama-shinanodaira