Shanxi is not from a specific chapter in the Book of Songs. The word "Shanxi" is not explicitly mentioned in the Book of Songs. However, the word western Shanxi is often used to describe beautiful scenery or imply beautiful things in ancient documents.
The Book of Songs is the beginning of China's ancient poems and the earliest collection of poems in the history of China literature. It is said that The Book of Songs was compiled into a book in the middle of 6th century BC, which was compiled by Confucius, the founder of Confucianism.