Just off the coast of Vietnam, a myriad of karstic islands are clustered in this picturesque setting. Looming out of the sea, undercut by erosions into fantastic shapes, they reminded the Vietnamese of the looping back of a swimming dragon. Scattered among them, whole communities of fishing families live most of their lives on sampans, trading among themselves and periodically going into nearby towns such as Haiphong to sell their catch and buy supplies.