Beaufort Island is a member of the Po Toi group of islands in Hong Kong. Its size is about while its highest point is above sea level.
The channel next to Beaufort Island called Lo Chau Mun, or Beaufort Channel, is the deepest part of Hong Kong at below sea level.
According to the local government, several plant species of conservation concern are present on Beaufort Island such as Eulophia flava ( é»Âè±ç¾Âå è ), Podocarpus macrophyllus (ç¾ æ¼¢æ¾), Polygala polifolia (å°Âè±é å¿Â) and Rungia chinensis (ä¸Âè¯å©å ÂèÂÂ).
The 140-million-year-old Po Toi Granite, which forms nearly all of Beaufort Island, is the last large magma intrusion in Hong Kong. Megacrysts are commonly found.