Based on the about works, the conclusions drawn are as follows: (1) the sand ridge of the Dongsha sandbank lies on the west.The west tidal flat is narrower and higher and the coastline is straight.

• 研究结果表明，东沙的沙脊偏于西侧，西侧滩面较窄、高程较高且岸线较为顺直，东侧滩面较宽、高程较低且岸线较为破碎；