Kyoto is promoting an additional attraction little known to date — onsen, or hot springs.

The city of Kyoto has 15 sources of hot springs featuring hydrogen sulfide, natural radium and other ingredients, and there are a total of 22 spa resorts, according to the municipal government.

As the presence of hot springs in the ancient capital of Japan has been little known to date, 18 spa facility operators founded an association under the city office's leadership in November 2015 in a bid to lure tourists.