Where is the third valley of dandelion's destination in Genshin Impact?

The third hook of Genshin Impact dandelion is as follows:

Tools/raw materials: vivoiqoo, OriginOS 1.0, Yuanshen 2.4.

1. Players go to the safe house to find fools and beat them.

2. Looking for "EMI" from the perspective of elements, and finally being led to a cabin on the desolate beach, and entering the copy to save "EMI".

After the rescue was successful, I went to Miss Lyudhika's residence and told him it was safe.

Find the barren valley and give us a letter and a letter from Maura.

5. Go to the lightning god's house to find "EMI" so that Miss Lyudhika can be recovered.

6. I found it on the boat to the outlying islands.

7. Give her something to finish the task.