Nagoya & Onsen (indoor) in Winter Jan 2013

I will be going to Nagoya and wanted to try the onsen (within the room). Are there any good ones nearby Nagoya and maybe overlooking some mountains or sea? Many thanks!

Michael

How near?

Although they are fully man made and artificial, I was amazed by the baths of the Nagashima Spa Land (and I usually prefer traditional ones):
http://www.japan-guide.com/e/e3313.html

Gero Onsen is a famous hot spring resort north of Nagoya, but many foreign tourists don't like it that much:
http://www.japan-guide.com/e/e5990.html

For really great baths in the mountains, Okuhida is great, but it is rather far away from Nagoya:
http://www.japan-guide.com/e/e5940.html