banzainetsurfer has added a photo to the pool:
Yamadera (山寺) is a scenic temple located in the mountains northeast of Yamagata City. The temple grounds extend high up a steep mountainside, from where there are great views down onto the valley. The temple was founded over a thousand years ago in 860 as a temple of the Tendai sect under the official name Risshakuji. Its popular name, Yamadera, literally means "mountain temple" in Japanese.
Source: www.japan-guide.com/e/e7940.html
Nokyodo Hall, where copied sutras are kept, is the oldest building on the mountain. The Lotus Sutra, copied over four years at Okunoin, is kept here. It is a (Yamagata) prefectural designated cultural property and underwent dismantling and repair in 1987.
Source: rissyakuji.jp/










