There are many caves along the southwest coast of the island and Niyathiya Cave is on west side of Kawahira-ku.
Next is an amusing video. On the left is our visit in 1990 and this year (2015) is on the right.
This is the 'Fertility Stone' (or, in Japanese, Kodakara-ishi - 'Child Stone')
It is believed that if the woman thinks the stone is heavy, she will bear a boy;
For further reading about Ie Shima: