The first Bay of jinsha River, also known as Moon Bay, is located at the junction of Benzilan Town, Deqin County, Yunnan Province and Zigeng Town, Derong County, Sichuan Province. The Dingqu River, which runs through the whole country from north to south, has been embraced by the Mayi River and the Shuoqu River, and brought the water of the three rivers into the embrace of the Jinsha River. At the confluence of the rivers and waters, it forms a wonderful scene of two rivers between three walls.
　　Through the mountains and valleys of the Jinsha River, so far more powerful water. The canyon on both sides is gradually opening up. When jinsha River is about to rush out of the Sichuan-Yunnan fortress, it seems that it wants to relieve the fatigue of long-distance running. Therefore, it slows down and draws a big turn of ω shape around the pyramid-like Suncone peak. Shuanexpected this casual improvisation, has achieved a wonder, known as the first bay of the Jinsha River.

　　There is also a myth and legend at this great Bend of the Jinsha River: Tibetans living on the Qinghai-Tibet Plateau have believed in sacred mountains and waters since ancient times, which is closely related to the development of traditional Tibetan culture and the product of the interpretation of mountains and waters by plateau religions. According to the tradition of aboriginal people from generation to generation, the sacred mountain in Deqin County, Diqing Tibetan Autonomous Prefecture, Yunnan Province is called Geniba Wudoji in Tibetan language, which is translated into Chinese as The hero King Kong Heart. Sichuan Ganzi Tibetan Autonomous Prefecture De Rong County Zigeng that is now the waka town of the sacred mountain in Tibetan called Zigeng Ben suo, translated into Chinese called the top monk. People on both sides of the river lived a happy and peaceful life. However, the jinsha river suddenly like a unruly horse horse, choppy aggressive is rolling in and toward peaceful home in order to protect their people and their homes, two mountains in the podcast, frequently called, ", when in the jinsha river is flowing into the rushing bar, mountain hot, Mr Wu ill send task a python river-crossing in time, Blocking the Jinsha River with its huge body, so that it diverted to zigeng area; Zi Gengben immediately brandished his giant hand and released a vigorous dapeng to stop the fight to kill the python. As the roc flew away, it just saw the python dragging its heavy body from the ridge to the river. It suddenly hovered like an arrow to fly directly to the ground, a moment dead bite the python's head, kept beating the vigorous wings, desperately bite finally got rid of the manic python. The jinsha River is still flowing in the same direction. Not to be outdone, Genib, the son of Benzilan Mountain, jumped into the river and tried to block the water with his body to change the direction of the flow; The running house of Zigeng Sacred Mountain then arranged a red bull to join the war, and the other party summoned a fierce horse to fight, and so on, repeatedly fighting, the river is like a floating belt turning to fly. With the passage of time and the constant change of river flow direction, finally formed today's magnificent, imposing weight thin jinsha River first bay.