The India Directory: Or, Directions for Sailing to and from the East Indies, China, Australia, and the Interjacent Ports of Africa and South America, Volume 2
About half a mile N.E. of the North point of Lantoa lies Mah-wan Island, forming a passage between it and Lantoa, and another to the northward, between it and the northern shore. The depth in them is from 20 to 25 fathoms, and in the northern passage some rocks project ofF the north-east point of Mah-wan Island about one-third of a mile. H.M.S. Doris went through between Mah-wan and Lantoa, which passage has dangerous eddies, and is very narrow. The passage between the North point of Lantoa and the main is called the Cap-sing-moon passage.
The Cap-sing-moon Passage is formed between the North point of Lantoa and the main, and is separated into two branches by Mah-wan Island. That branch on the West side of Mah-wan Isle, being extremely narrow and very dangerous, ought never to be used by ships of any class; more particularly as the passage northward of that isle is wider, with good anchorage, a regular tide, and the advantage in the north-east monsoon of being to windward. Coming through Cap-sing-moon Passage from the westward, in proceeding to Ly-ee-moon anchorage, keep close to the mainland to avoid the reef off the N.E. part of Mah-wan, then keep close to the western side and South end of Chung-yue, and steer directly for the West end of Wan-chung-chow, observing, with a working wind, to follow the directions given above.
(The Lamma Channels, Ly-ee-moon Anchorage, and Cap-sing-moon Passages, were surveyed by Captain Blakely, of the Waterloo, in 1829, and are given in my Chart of Canton River and proximate channels, Cap-sing-moon Passage, or Throat Gates.)
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Capsuimoon
"The other day a junk which was at Capsuimoon was boarded by six men, who attacked the master and the other occupants with knives, inflicting several injuries upon them, subsequently taking away with them the oars. The matter was reported to the Police at Pinshau, and the ringleader was arrested. It transpired that the attack was the result of a quarrel between the master of the junk and the ringleader."
Source: Hong Kong Daily Press, page 2, 9th June 1900
Interesting the transliteration was here as 'Capsuimoon'. I assume this is the right place (as in between Ma Wan island and the mainland) as the report to the police was at Pinshau which I read as the nearby island of Ping Chau, off the NE coast of Lantau island.