What is the way to connect the mountains with each other?

Ropeways or suspension bridges between two mountains:

Ancient times

Method 1: Use a bow and arrow to shoot over a thin rope, this end of the rope is connected to the chain, and then pull the chain over. Repeat the process several times to build a cableway; the upper side of the wooden planks will become a suspension bridge.

Method 2: Fix one end of the chain, put it down, then put down the rope on the other side, then tie the rope and chain together in the river, then pull the chain up, repeat several times, can be built into a ropeway or suspension bridge.

2. Modern

Method 1: there are special mortar shells, commonly used in the military, but the rope on top is a very thin reinforced rope, hit the past and then pull the thick pull over, repeat many times, can be built into a ropeway or suspension bridge.

Method 2: there are helicopters, pull the rope over, and then pull the chain over, repeat many times, can be built into a ropeway or suspension bridge.

Of course there are places to save costs, it is also possible to use the ancient methods.