バリエーションルート

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.

• この山やまのバリエーションルートは上じょう級きゅう者しゃ向むけだ。

  The variation route on this mountain is for advanced climbers.

• 混こん雑ざつを避さけるため、バリエーションルートを選えらんだ。

  To avoid the crowds, we chose an alternative route.