Location: Some 30-minute boating away from the Con Coc Islet, on the way to Ba Trai Dao (Three Peaches) Island, visitors see a pen bobbing (But Islet) in the seawaters.
Characteristics: This constitutes a monument of knowledge Mother Dragon wanted to pass down to the present-day generations.

Lying adjacent to Pen Islet is a small attractive beach. Tourists can anchor there to take a bath.

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