I saw a bear in that valley.
In Hakone, there is a valley called Owakudani, which used to be called "Death Valley" a long time ago, and it is a famous tourist spot nowadays.
The guy who committed suicide in Death Valley was dressed as Darth Vader.
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it should use the kun'yomi reading. This happens to be the reading you learned with the kanji, too, so don't feel like you're stuck in a valley of despair or anything. Rejoice!