Ha Dan, aka Dan Ha Geomorphology (Danxia landform) is an extremely large area, stretching from southeastern to northwestern China's spectacular scenery with many picturesque. In it's most famous mountains Ha Dan "7 rainbow". 

Glance, these mountains every shape, style and color will make you think of the scene is not real fairy on earth, or that they are entirely the work of Photoshop. 

However, in fact this is a 100% natural product. 

Mountains have lost sight 

According to scientists, the mountain "7 rainbow" geological phenomenon is extremely special, only in China, and is formed from the Cretaceous. 

Mountains have lost sight 

The process of formation of the colored layers alternating yellow, green, red, orange, blue sequence is explained as follows: about 100 million years ago, the alluvial river in drought areas due to global warming. Sediments in this oxidized form rust color. 

Then about 30 million years, the activities continued geological changes created a thick layer of red soil around 3.700m. Not to mention the upper soil layer had a thickness of about 1,300 meters and was solid from the Cretaceous formation (Cretaceous century). Over time, flooding the land to erode, exposing each layer of red sandstone soil mixed with other minerals such as calcium, iron oxide, silica cement ... associated with sand forming streaks of vibrant color as the current this. 

Until now, mountains Ha Dan still in the process of natural creation, with an average increase of about 0.87 m per 10,000 years in the past 500,000 years. 

Also, over time, a portion of red sandstone cliffs eroded create magical caves, with designs and different sizes. Especially as most of these caves are dry and separate, tend not deep or information linked together as cave systems elsewhere.

Beautiful scenery of the mountains long Ha Dan helped Dan Dao Street, Ha region became one of the famous scenic spots in the world. By Dan Ha, and at sunset, you will be overwhelmed by the yellow sun screening on the reef adds to the already colorful brilliance in this place.

Part of Dan Ha was also chosen as the backdrop for the film A Woman, A Gun, and A Noodleshop directed by Zhang Yimou in 2009.

Not only the mountains, valleys colorful splendor, Dan Ha, there are many rivers and streams and picturesque waterfalls.

Because of the unique natural beauty, exotic mountain ranges that separate the Hanoi People, and the region in general Geomorphology Ha Dan has been recognized as a UNESCO Natural Heritage of the World in August / , 2010.

The best time to visit the famous scenic spots and this is still wild about mid-May, when the weather is relatively mild (high temperature of 30 degrees Celsius, the lowest average 8 degrees C) and not rain