• 谷たに — valley
• 谷間たにま — gorge / ravine / cleavage
• 峡谷きょうこく — canyon / gorge
• 渓谷けいこく — mountain valley

谷 describes a valley — a low area between hills or mountains, often with a river running through it. In Japanese writing it can also suggest contrast, like “peaks and valleys,” and sometimes appears in names and places.