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![Dreamy sunset among the rocks of Halong Bay, Vietnam.](/web/20161112002311im_/http://www.traveller.com.au/content/dam/images/g/r/g/7/n/t/image.related.thumbnail.300x200.gsm75c.png/1478748993651.jpg)
Reader tips: Best and worst bits about travel to Vietnam and Cambodia
Halong Bay is picturesque – but swimming can be challenging.