The modern and orderly island name of Island 6.

Echo is the sixth largest island (island reef) in Xisha Islands. Echo is a reef island on the north bank of Shiyumen in Xisha Islands, also known as "Yin Zhi".

It is said that it was named after a large collection of silver here in the Qing Dynasty. There is also a saying that there is no sunken ship here, named after leaving silver. The reverberation is located in a building 15km long and 1 at its widest point. On the 4 km crescent reef plate, the geographical coordinates are16 35' north latitude and112 42' east longitude, which is a sandbank with an area of 6 100 square meters.