| Location: Haeng Toi and Dao Da Be, Halong Bay, Vietnam |
| Several hundred meters long and filled with varied geology, Haeng Toi is perhaps the finest remaining tidal sea cave in Halong Bay. 1 Following Lead Guide Cuong Ngugen’s tidal skills, we explored three great caves and a small hong in the back corner. The first two caves and the small, hidden hong are featured. |
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