Other sites for bird watching and researching:

• Avibase – Bird Checklists of the World – Vietnam:
  • https://avibase.bsc-eoc.org/checklist.jsp?lang=EN&p2=1&list=avibase&synlang=VI&region=VN&version=text&lifelist=&highlight=0
•  Bird Watching Vietnam:
  • http://birdwatchingvietnam.net/name

Online tools:

• Tidal Table of Northern Vietnam (Bảng thủy triều miền Bắc Việt Nam) (nước ròng: mực nước thấp nhất, nước lớn: mực nước cao nhất)
  • http://www.nasico.com.vn/home/category/84/lich-thuy-trieu.html