Legend has it that at the beginning era of this country, the Vietnamese had to face fierce invasion from another country coming from the North through the sea. In order to help the people fight against invaders, the Emperor Jade sent a mother dragon down together with her children to stop the enemy’s ships. As the ships advancing into Vietnam’s ocean, the dragons spat fire at them. At the same time, they were spitting out jewels and jade which turned into islands and islets dotting the emerald waters and linking together to form a great wall preventing outsiders’ intrusion.