From the tunnel to the lower reaches of the Dulong River, the difference in elevation exceeds 2,000 meters. Staff at the management station of the Gaoligong Nature Reserve conduct their daily patrols here. They have the privilege of witnessing four seasons in a single trip. Check out the video for how this privilege works. 

About Journeys in Nature: Timeless Valley Series

Dulongjiang, known as the "last uncharted land in Yunnan," is a deep valley on China's southwestern border between the Hengduan Mountains and the Qinghai-Xizang Plateau. The place was once shrouded in mystery, until a highway connecting the valley to the outside world was opened in 2014. In this series, CGTN Nature takes you on a ride to unveil the incredible fauna and flora as well as the minority Dulong people who call this place home.

For more:

Timeless Valley Series Ep. 1: Access to valley with only one road

Timeless Valley Series Ep. 2: Forest dwellers' order of coexistence

Timeless Valley Series Ep. 3: The mountain villagers' wisdom

Timeless Valley Series Ep. 4: Using technology to understand Mishimi takins

Timeless Valley Series Ep. 5: How does it feel to wear a rainbow?

Timeless Valley Series Ep. 6: Dulong women's awe of nature

Timeless Valley Series Ep. 7: Dulong people's sacred cattle

Timeless Valley Series Ep. 8: Amazing plants, food or detergent?

Timeless Valley Series Ep. 9: 'Mirrors' that can tell the weather

Timeless Valley Series Ep. 10: A river that connects all life forms

(Cover image a video screenshot; video by the CGTN Nature film crew)

(If you have specific expertise and want to contribute, or if you have a topic of interest that you'd like to share with us, please email us at nature@cgtn.com.)