Our studies confirm that an anticlockwise rotating M_2 and aclockwise rotating S_2 amphidromic system at the southwest of the Sunda Shelf.

• 本文在大纳土纳群岛的西南部给出了一个M_2反时针方向旋转的无潮点,一个S_2顺时针方向旋转的无潮点。