Hot springs that remain intact Hidden hot spring list(Niigata) [Hot springs deep inside Japan]

List of Hot springs in Japan that remain intact or a little bit artificial or artificial with some recomendations.
sangakuonsen.com (*Writen in Japanese.)

sangakuonsen.com (*Writen in Japanese.) for the location of a Mountain on Google map.

(Caution!)
H2S gases or a Bear can be conflict at the site listed below.Please keep out those sites,even if at your own risk. (Must see if you don't know the risk of H2S or anoxia at all. written in Japanese.) anoxia/H2S-Helth department Japan
(*)number of astarisks represents impression. The list of Ryokans with hidden onsen or not known much.

Prefecture	Area-name of SPA	hidden spring type	charge	mix/seperate	impression	comment	image(link)
Nagano	Japanese North Alps Renge	pablic bath	Free	Seperate	**	Unparalleled view volcanic system jigoku
Nagano	Japanese North Alps Renge	hidden spring		Mix	*****	a bear is also likely to take a bath
Nagano	Mt. Myoko Tsubame hot spring	hidden spring	Free	Separate partly	***	It was impressed by the white R/rent.
Nagano	Mt. Myoko Tsubame hot spring	remain intact	Free	Mix	****	Ski slope side
Niigata	Sea valley mountain mass Kajiyama former R/rent	bath house	UpToU	Mix	*****	Please dig too much and, but appreciate.
Niigata	Matsunoyama Usagi	bath house	UpToU	Mix	*****	Spring quality and a feeling of opening
Niigata	Yuzawa Akayu	hidden spring	Free	Mix	*****	The hidden hot spring in Mt. Naeba
* There might be some places that described as free in this page but some donations up to you expected.