Overhead cable---sliding bridge over high mountains and valleys

Natural Landscape and Terrain Features

Geographical Environment of the Nujiang Gorge

The Great Nujiang Gorge【Great Nujiang Gorge（怒江大峡谷）】is flanked by the Biluo Snowy Mountains【Biluo Snowy Mountains（碧罗雪山）】and the Gaoligong Mountains【Gaoligong Mountains（高黎贡山）】. Layer upon layer of rolling mountains stretch across the land, dotted with towering jagged rocks and sheer precipices. The river surges swiftly and turbulently through the valley. Since ancient times, this region has suffered from extremely poor transportation. A local saying goes: "Even blue sheep find no path, and monkeys dare not venture here."

Only a few ferries are set up at sections with relatively gentle currents, where wooden boats can shuttle across the river. Apart from these spots, it is impossible to build bridges or wade through the water. For generations, the Nu Nationality【Nu Nationality（怒族）】living on both river banks relied solely on overhead cables to travel across the gorge and maintain contact with one another.

Introduction to Overhead Cable

Craft and Usage of Overhead Cable

Overhead cable【Overhead Cable（溜索）】is a vital and irreplaceable traditional means of transportation for the Nu people. Its production and usage follow fixed traditional techniques. Workers first twist bamboo strips into thick ropes as sturdy as human wrists. These bamboo ropes are stretched across the river and firmly secured to large trees, wooden stakes or rocky cliffs on both sides.

People travel across the river with the help of a sliding board【Sliding Board（溜板）】, also known as a clipper. This solid wooden tool measures 7 to 8 cun【cun（寸，中国传统长度单位）】in length and around 4 cun in width. Two symmetrical holes are carved on its back for tying ropes. When using it, people place the groove of the board onto the bamboo rope. They thread flax ropes or leather belts through the holes and fasten them around their waists. Lying flat against the sliding board, they glide across the river by leveraging gravity.

Classifications and Characteristics of Overhead Cable

Overhead cables fall into two main types: flat cable and steep cable.

Flat cable【Flat Cable（平溜）】adopts a single horizontal rope with almost no gradient, allowing travelers to cross the river in both directions. This way of travel is quite laborious. As the middle section of the rope sags naturally, travelers have to pull themselves forward hand over hand using all their limbs to reach the opposite bank once they get to the middle of the river.

Steep cable【Steep Cable（陡溜）】is equipped with two separate ropes for outbound and inbound trips respectively. Each rope is set at a slant, with one end higher and the other lower. It enables fast and effortless crossing, yet it comes with higher risks. Travelers must stay highly alert to avoid injuries.

Cultural Origin and Modern Development

Functions and Folk Origin

Overhead cables can carry not only people, but also goods and livestock. According to local legends, the Nu people drew inspiration from spiders that weave webs between trees and crawl freely back and forth, and thus invented this unique transport tool.

Inheritance and Evolution in Modern Times

With social development, multiple modern bridges have been constructed over the Nujiang River. Nevertheless, overhead cables remain beloved by the Nu people and still serve as a traditional transport facility across the river. Fragile bamboo ropes have now been replaced with durable iron ropes matched with pulleys, making the ancient transport method safer and more practical.

Supplementary Notes

1. Unified Annotation Rule

   Proper nouns are marked with Standard English (Chinese) on their first appearance, consistent with all previous Nu nationality related texts. Corrected the original text’s misdescription of cun (a traditional Chinese length unit, not weight unit).

2. Main Grammar & Expression Revisions

• Fixed sentence fragments, subject-verb disagreement and collocation errors in the original passage;
• Polished repetitive descriptions while retaining all technical details, classifications and folk legends;
• Revised typos such as Nuiang River to the standard Nujiang River.

1. Cultural & Background Supplement

   Added basic folk custom background of Nu people’s cable-crossing culture; sorted out the logical hierarchy of terrain, tool production, classification and modern changes.