1. Because the mountains here are high (the mountain peaks cross the Tianhan), the roads are dangerous (the caves are made of wood, and the floating water is a plank road), the wind is strong (the wind in Lin Siting is not high), and the waves are urgent (the river is swift and the stone peaks are doubtful).

2. Northeast, due south and northwest.

3. The pictures don't need to be very similar, but according to the description in the article, they show the characteristics of these trees, which are rooted in soil and stones, with sparse branches and lush leaves.

4. Combination of scene change and fixed-point observation. There is no unified answer in the second half of the question, as long as it makes sense. Reference answer: it's a bit messy. According to the observation order, first north, then west, then south, but first skip writing east; Writing what you saw in the south, up and down, is also a bit messy. (Negative opinion: not chaotic. Youlong Gate should focus on the gorge, with the ancient north-south direction detailed and the east-west direction sketched. It is more reasonable to write "East" after "West" and skip "South". )