Ravine
Gorge, Canyon
noun
A ravine in a valley is still a ravine. It can also be a gorge or a canyon. They're usually really big. Like the Grand Canyon!
きょうこく
This is a jukugo word that uses the on'yomi readings of the kanji. You haven't learned this reading for 谷 yet, so here's a mnemonic to help you:
If you're going to travel through a huge ravine you have to stay hydrated. The best thing to bring is some taste, cold Coke (こく). Nothing quenches your thirst from sweating through a long, rough ravine like delicious Coke!
この峡谷に架かる吊橋を渡ったことはありますか？
Have you ever crossed the bridge that spans over this ravine?