noun
variation route; alternative route
Primarily used in mountaineering and climbing to refer to a less-traveled or alternative path to a summit or destination. Can also be used more broadly for any alternative route.
この山のバリエーションルートは上級者向けだ。
The variation route on this mountain is for advanced climbers.
混雑を避けるため、バリエーションルートを選んだ。
To avoid the crowds, we chose an alternative route.