Treasure Island is like a jewel in Do Son Beach and is increasingly attractive to visitors. Visitors to the island not only by the sacred Nam Hai Than Temple with legendary stories but also visit the attractive eco-tourism. Hon Dau Island is located about 1km from Do Son Peninsula. The ancient land of Do Son has nine mountains, such as nine dragons, which head toward Dau Island. All over the country, rare islands with a small area of less than 1 km2 have and preserve the wild features as in the island.