Nhon Hai Beach, about 30 km from the south central beach town Quy Nhon, has been gathering increasing attention of tourists in recent years.
Locals say that layers of the seaweed called Sargassum which usually thrives on coral reefs and underwater rocks emerge from the water surface once they are fully grown, during the dry season between May and July, resembling an "underwater golden forest."
This is also the most ideal time to harvest the seaweed that is used as medicine for goiter and as fertilizer, so this is the time of year that fishermen get out in their coracles with fishing nets.