Pac Sui Waterfall - From the legendary chicken king to an ideal eco-tourism destination Coming to the beautiful land of Tien Yen, you cannot miss an amazing natural destination, a unique highlight of Tien Yen tourism, which is Pac Sui Waterfall with its pristine forest landscape and rich flora system. Rich and diverse, it is praised as "Where the dawn awakens" associated with the legendary story of the Chicken King - a symbol of strength, perseverance and desire to call the dawn, dispel darkness and darkness.