Phong Nha Caves underground Vietnam

The world's longest underground river winds through Vietnam's Phong Nha cave (Phongnha) cave system, the name of which translates as " The wind's fang". Entering this cave is like venturing into the mouth of a giant beast, all the more mysterious since the cave rings with strange noise. Locals say it is music from a banquet hosted by the mountain God, but the acoustic tricks are actually echoes, which bounce off the limestone cliffs of the cave.

Shaped like a tube with a roof curved like the hull of a boat, this cave has acoustics properties similar to those of the fingal cave in Scotland, most importantly, all the primitive stone caves were preserved in their original form. Thus, visitors almost feel like they are going on a trip to the center of the earth.

he Son River flows into the mouth of the cave and continues underground, where it is known as the Nam Aki River . It emerges 20 km to the south near Pu-Pha-Dam Mountain .

Phong Nha Caves , also called Troc Caves , lie in the limestone cliffs of Ke Bang in Quang Binh province, 50 km northwest of Dong Hoi. Like most of the caves in this area, the Phong Nha Caves were shaped by the Chai River . The farther onne gets inside the Phong Nha Caves , the more illusory the stalactites and stalagmites look as they glitter when bright light is shone on them.

The main cave system contains 14 chambers, linked by an underwater river that runs for 1.5km. Secondary corridors branch off in all directions. The Outer Cave and some of the Inner Caves have roofs that tower between 25 and 40 meters above the water level.

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Things you need to know when Travelling Within Vietnam

Vietnamese people are very gracious, polite, and generous and will 
make every effort to make guests feel comfortable. These are the experiences that will enrich your visit to Vietnam. 

Vietnam people and culture

DO 

* Store your cash, credit cards, airline tickets and other valuables in a safe place. Most 4-star hotels have in-room safes; otherwise ask the reception to keep your valuable things in their deposit facility. 
* Always be careful of the belongings you carry with you during your holiday. 
* Take care of all your valuables. Never leave your bags unattended 
* Vietnamese dress conservatively. Despite the heat, it’s best not to show off too much skin. If you do, especially girls, you’ll only draw stares from the locals. 
* Dress discreetly while entering temples and other religious places. 
* If invited into a home, always remove your shoes at the front door when entering. 
* Ask for permission when taking a photograph of someone. If they indicate that they do not want you to, then abide by their wishes. DO NOT offer money or push the issue. 
* Use waterproof sun cream if you plan to spend a good amount of time in the water when you travel to Vietnam. 
* Change money from a recognized moneychanger. 
* Indulge in some haggling while buying goods without price tags whenever you go shopping in Vietnam. 
* Travel with recommend tour agencies. Even if you plan to buy tickets when in country, research your journey a little first on the Internet. 

vietnam people and culture

"xe om" vietnam 

DON’T 

* Never carry more money than you need when walking around the streets. 
* Do not wear large amounts of jewelry. There are two reasons for not doing this: (1) It is considered impolite to flaunt wealth in public; (2) It is more likely that you may become a victim of a pickpocket or drive-by bag snatcher. 
* When taking a ride by motorbike taxi (xe om) make sure your bag, if any, is not on display or easy to grab. Bag snatches, although still rare, are probably the most likely crime a tourist would encounter, and it raises the probability immensely if you are tailing a camera or a laptop in the wind. 
* Don't wear singlet, shorts, dresses or skirts, or tops with low-neck lines and bare shoulders to Temples and Pagodas. To do this is considered extremely rude and offensive. 
* Avoid giving empty water bottles, sweets and candies or pens to the local people when trekking through ethnic minority villages. You cannot guarantee that the empty bottles will be disposed of in a correct manner, and the people have no access to dental health. If you want to give pens, ask your guide to introduce you to the local teacher and donate them to the whole community. 
* Never sleep or sit with the soles of your feet pointing towards the family altar when in someone’s house. 
* Do not try to take photographs of military installations or anything to do with the military. This can be seen as a breach of national security. Never take video cameras into the ethnic minority villages. They are considered to be too intrusive by the local people. 
* Physical displays of affection between lovers in public are frowned upon. That’s why you may come across couples holding hands but not hugging or kissing. 
* Losing your temper in Vietnam means a loss of face. Keep a cool head and remain polite, you’ll have a greater chance of getting what you want. 
* Remember, this is Vietnam, a developing country, and things don’t quite work as you are maybe used to. Don’t be paranoid about your safety; just be aware of your surroundings. 

The above advice is meant to help you have a perfect trip to Vietnam. 

Do not be overly paranoid though. Generally, Vietnamese people are very appreciative if they see you trying to abide by their customs, and very forgiving if you get it wrong or forget. If you make the effort, you will be rewarded.