a collapsed cave which forms a hidden lagoon at the centre of a small island - pretty common in this bay filled with pointy islands of sheer limestone (very similar to the karsts around Yangshuo)
A mercantile establishment or factory for foreign trade in China, as formerly at Canton; a succession of offices connected by a common passage and used for business or storage.
From the early 19th to the 20th century, a hong referred to a trading company or store out of Hong Kong, Macau and Canton, China that did internal trade with southern China. The term is transliterated from the Cantonese word 行.