古力由不洞是明朝《鄭和航海圖》十七的一個島嶼上標明的地名，在龍牙交椅之西[1]。向達教授注曰，古力由不洞或謂即Butang Islands, 古力是占城語「島」（kulao）的對音[2]。 英國學者J.V.G.Mills 也認為古力由不洞指馬來半島西海岸的Pulao Butang Island[3], 李萬權，朱鑒秋也認為古力由不洞是馬來半島西岸的Butang Group，即布坦群島[4]。
參考文獻
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