(VNF)- The 400-meter zip-line in a UNESCO-recognized national park located in a central province has been recognised as the longest zip-line route in Viet nam.

The zip-line, which spans over the Chay River to the entrance of Toi Cave (Dark Cave), has been named the country’s longest of its kind by the Vietnam Book of Records (Vietkings).

The cave is secluded in the Phong Nha- Ke Bang National Park in the central province of Quang Binh, which is also home to Son Doong Cave, the world’s current largest.

A foreigner is seen swinging on the zip-line in the UNESCO-recognized Phong Nha- Ke Bang National Park, located in the central province of Quang Binh. Photo: Vietnam government's portal.

The zip-line system has been operational since September last year, drawing approximately 30,000 adventuresome trekkers, most of whom are foreigners.

The service allows tourists to glide into the cave or plunge into the river by swinging on it.

Zip liners will be dazzled by the gorgeous aerial views, relishing a large chunk of the Chay river and the lush jungle snaking between mountains beneath. They can also dip themselves into the turquoise water.

People who choose to try the zipline, which cost VND7 billion (US$331,000) apiece, will receive guidance from a team of specialists to ensure their maximal safety.

The Dark Cave, which is almost 5.3 kilometers long and 80 meters high, is located approximately 20 kilometers from Phong Nha Cave. The cave was first explored in the 1990s by Howard and Deb Limbert, who were members of the British Cave Research Association.

Along with the Son and Trooc Rivers, the Chay River is among Phong Nha-Ke Bang park’s three principal underground river systems, which span a total of 20 kilometers in length.

In related news, an art performance was held in Quang Binh province on Wednesday evening to launch the “Quang Binh Spectacular Cave System Discovery Week”.

The show featured over 20 music, dancing and singing performances which highlighted the province’s cultural identities.

Addressing the night, representatives from the provincial People’s Committee announced perse activities such as the launch of new tourist destinations, promotions and tourist discounts and farm trips.

They noted that the festival is an opportunity for tourists, locals and representatives from businesses to relish the park’s awe-inspiring scenery and obtain an insight into the province’s historical and cultural values.

Phong Nha-Ke Bang National Park, some 500km south of Hanoi, is secluded in a 2,000km² limestone zone in Vietnamese territory that borders another similarly sized limestone zone called Him Namno in Laos.

The area is noted for its over 300 caves and grottos with a total length of over 70km, with 39 new ones discovered last year.

Prior to the discovery of Son Doong Cave, the world’s current largest, Phong Nha held several world cave records, as it boasts the longest underground river, as well as the largest caverns and passageways in the world.

The park was listed among UNESCO's World Heritage Sites in 2003 and 2015 for its immense geological value, resplendent landscape and rich biopersity.

Recently, the New York Times named Quang Binh as one of the most alluring destinations in Asia and the world’s 52 top must-go sites for 2014./.

by VNF