| Readings | On-reading | どう |
| Kun-reading | ほら | |
| Meaning | den / cave | |
| Radical |
水(氵,氺)
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| Stroke count | ９ | |
| JLPT Level | N1 | |
Stroke order of 「洞」
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Vocabulary contains 「洞」
| Word | Meaning |
| 洞窟（どうくつ） | cave |
