同車牛山(shan)(shan)島(dao)(dao)和達山(shan)(shan)島(dao)(dao)(又稱(cheng)達念山(shan)(shan)島(dao)(dao))統稱(cheng)為(wei)前三(san)島(dao)(dao),距車牛山(shan)(shan)島(dao)(dao)18.8公(gong)里(li)(li),距達山(shan)(shan)島(dao)(dao)15.1公(gong)里(li)(li),島(dao)(dao)長900米,寬(kuan)300米,總(zong)面積(ji)0.148平(ping)(ping)方公(gong)里(li)(li);平(ping)(ping)均水(shui)(shui)溫14.0℃;潮汐(xi)大流(liu)速為(wei)131厘米/秒(miao),鹽(yan)度(du)變(bian)化小,是一類海(hai)(hai)水(shui)(shui)水(shui)(shui)質;海(hai)(hai)底地貌主要由(you)基巖(yan)海(hai)(hai)蝕平(ping)(ping)臺(tai)—陡坡(po)、水(shui)(shui)下渡(du)積(ji)坡(po)—堆(dui)積(ji)斜坡(po)、水(shui)(shui)下侵蝕堆(dui)積(ji)平(ping)(ping)原三(san)種類型組成(cheng),近海(hai)(hai)1公(gong)里(li)(li)外(wai)為(wei)細砂底質,適合打樁進(jin)行筏式養殖。三(san)島(dao)(dao)總(zong)面積(ji)0.32平(ping)(ping)方公(gong)里(li)(li),在海(hai)(hai)中如三(san)星(xing)錯(cuo)落、云遮霧障,早有(you)“傳聞(wen)海(hai)(hai)上(shang)有(you)仙山(shan)(shan),山(shan)(shan)在虛無縹緲(miao)間”的說法。