glen, dell
Another word for a small valley is a dell.
No one knows because it is hidden. That is why it is called the Hidden Valley.
alley?
Hidden Valley Farm was created in 1858.
The Hidden Valley of Oz was created in 1951.
Crypt is a word meaning hidden. Therefore, cryptology is the study of hidden information, encryption means to make hidden, and cryptic is that something's meaning is hidden. Another word is cryptography, which means hidden writing.
vale
hidden
Hidden Valley National Park was created in 1982.
Unobtrusive, hidden, inconspicuous, obscure...
Poets use the word 'vale'. "In this vale of tears..."
The area of Hidden Valley National Park is 20.68 square kilometers.