CAVE OKINAWA(沖縄本島)
https://i.imgur.com/O7iYu91.jpg
https://i.imgur.com/q3TH4RO.jpg
https://i.imgur.com/lwflwGV.jpg
https://i.imgur.com/AZyv9zl.jpg

観音寺鍾乳洞(沖縄本島)
※ 公開中止で入場料なしで入口付近だけ入洞可
https://i.imgur.com/tTG2rHM.jpg
https://i.imgur.com/7c7VYm0.jpg

ニャティヤ洞(沖縄・伊江島)
https://i.imgur.com/4kvf57T.jpg
https://i.imgur.com/PUuMdJJ.jpg
https://i.imgur.com/0gRIttT.jpg
https://i.imgur.com/f5rulRF.jpg

ニャティヤ洞近辺の洞窟
https://i.imgur.com/Hysgs2Q.jpg
https://i.imgur.com/0aDss3A.jpg

ヤゴー(鹿児島・与論島)　※ 地下の湧き水
https://i.imgur.com/BtWvOHB.jpg
https://i.imgur.com/5gDdIBe.jpg