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| 空洞 (くうどう) River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 石灰洞 River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
| 洞窟 (どうくつ) | |||
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| 岩屋 news2 nf31 spec2; 石屋 (いしゃ); 窟; 岩穴; 岩窟; 巌窟; カバーン; 石窟 | |||
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| 大洞窟 Geological Terms Dictionary (Bruce Bain and Leslie Oberman) | |||
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| 洞窟 news2 nf29 spec2 (どうくつ) | |||
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