What are the producing areas of Huian agarwood?

Huian system has always been a special existence in agarwood, which is quite famous. There used to be a saying that the ancient Hui 'an god refers to Hainan Aquilaria sinensis, but with the decline of Hainan wild Aquilaria sinensis, it later refers to Vietnam Hui 'an. There is another saying: Huian is the distribution center of ancient agarwood in Vietnam, so the agarwood exported here is called Huian God. In today's market, the agarwood produced by countries near Indochina Peninsula can be called "Huian agarwood". This includes: Viet Nam, China Hainan Island, Laos, Cambodia, Thailand, West Malaysia and other regions. It is suggested that the subject buy an introduction to agarwood and learn systematically. Suggestion " Is it broken? Solution? A sink? Is it sweet? Actor? Capital? Accept? Hide? Mysterious? Medium? Mysterious.