敦謙沙洲

敦謙沙洲，南沙群島中的一個有領土爭議的沙洲。1974年，中華民國原本有軍隊駐守，在當年颱風經過之下，在中華民國軍隊為了躲避颱風警報撤回太平島時，越南派兵占領至今，越南當局將該沙洲改稱「山歌島」（越南语：Đảo Sơn Ca／.mw-parser-output .han-nom{font-family:"Gothic Nguyen","Han-Nom Gothic","Minh Nguyen","Han-Nom Minh","Nom Na Tong","HAN NOM A","HAN NOM B","TH-Khaai-TP0","TH-Khaai-TP2","TH-Khaai-PP0","TH-Khaai-PP2","TH-Sung-PP0","TH-Sung-PP2","TH-Sung-TP0","TH-Sung-TP2","TH-Sy-P0","TH-Sy-P2","TH-Ming-JP0","TH-Ming-JP2","Ming-Lt-HKSCS-UNI-H","Ming-Lt-HKSCS-ExtB","FZKaiT-Extended","FZKaiT-Extended(SIP)","FZKaiS-Extended","FZKaiS-Extended(SIP)","Sun-ExtA","Sun-ExtB","MingLiU","MingLiU-ExtB","MingLiU_HKSCS","MingLiU_HKSCS-ExtB","SimSun","SimSun-ExtB",sans-serif}島山歌），外文資料稱作“Sand Cay”。目前由越南實際控制，但目前中華民國與中華人民共和國都聲稱對此島擁有主權。