Sentence:  Speaking of an interesting group of people near Canton, he says : Both the <WSD>Tanka</WSD> (boat people) and Hakka (another ethnic group, distinct from the Cantonese, living on land) have distinctive dialects and differ in phvsique from The Cantonese. 
Meaning of the word marked with <WSD> tags:  An ethnic group of boat people in the Canton area.