The name of this place is Takegawara Hot Spring, Beppu Onsen is the area.
Takegawara Hot Spring offers two kinds of onsen, one is hot sand onsen for 1030 yen or the traditional onsen for only 100 yen. The water of the traditional onsen is 43 degrees.
Worth a visit. Beppu is a city with beautiful scenery and lots of old style 温泉 (hot baths). Be prepared to explore them with soap and towel as most stick to their traditional ways and will only provide with hot water (which is why you're here after all).
I enjoyed my time here and so will you as long as you like visiting Onsen (hot baths).
The place mark in the Google maps is nothing about the point. Beppu onsen is a very large area around the place mark.
The very best hot springs area in Japan.
Beautiful group of onsens with a down to earth feel
Careful, the location on Google maps is deceptive. Once you find the ACTUAL location they will bury you in hot sand. Very cozy. It's a bit too quick (only 10 minutes), but worth the experience. You can buy towel there, or bring your own if you got one.