5 Lipstick River, starting of HCM Trail Northern Vietnam picture - The Son (Lipstick) River flows into the mouth of the cave and continues underground, where it is known as the Nam Aki River. It emerges 20 km to the south near Pu-Pha-Dam Mountain.
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The Son (Lipstick) River flows into the mouth of the cave and continues underground, where it is known as the Nam Aki River. It emerges 20 km to the south near Pu-Pha-Dam Mountain.