noun
crossing a valley; traveling from valley to valley
Refers to the act of moving across or between valleys. Can be used literally for travel or figuratively in poetic contexts.
山道は谷渡りが多く、歩くのに時間がかかった。
The mountain trail involved many valley crossings, so it took a long time to walk.
noun
singing of the Japanese bush warbler
A poetic or seasonal term for the song of the Japanese bush warbler (uguisu), often associated with spring and mountain scenery. Not an everyday word.
When spring comes, you can hear the valley-crossing song of the bush warbler from the mountains.
The bird itself; 谷渡り refers specifically to its song echoing across valleys.
Compound of 谷 (tani, 'valley') and 渡り (watari, 'crossing'). The bush warbler sense is a poetic extension, likening the bird's song to a traveler crossing valleys.