On the long climb up to Shosanji, temple 12, on the Shikoku pilgrimage there are three sites associated with Kukai, the second being Ryusui-an.
According to the legend, when Kukai was climbing the mountain back in the early ninth Century he stopped here and by tapping the ground with his staff caused a spring to start flowing. According to many legends associated with kukai he did this many, many times all over Shikoku.
There used to be a shokubo, temple lodgings, here but it has long since closed down. There is a really cool looking tree though.