Legend has it that at the beginning of the Vietnam era, the Vietnamese people faced a fierce invasion from a northern country via the sea. In response, the people prayed for a miracle. Emperor Jade then dispatched a mother dragon and her offspring to help the people repel the invaders. As the ships advanced into Vietnam's waters, the dragons breathed fire upon them. At the same time, they expelled jewels and jade, which transformed into islands and islets in the emerald sea, linking together to create a substantial barrier against external incursions. After defeating the invaders, the dragon fell in love with the tranquil seascape and decided to make its home in the bay. Thus, the spot where the mother dragon descended is now known as Halong Bay. The name 'Halong' comes from the notion that the dragon descended into the bay.