Map of Dongzhai Port Nature Reserve
The coordinates shown for all tentative sites were produced as a community effort. They are not official and may change on inscription.
I visited the Mangroves during my Christmas holiday 2015 in China. Are they nice? Yes they are. Should it be a UNESCO WHS? Maybe, I think it's a unique place on Hainan Island. If UNESCO or not it should be protected. To be honest I don't see it so quickly becoming a WHS. On the link you find some photos.