This is the 9011th most frequent Spanish word.
valles
"Valles" means "valleys" in English.
The word 'valles' is used literally to refer to geographical lower plains situated between mountains.
Los valles entre las montañas estaban llenos de verde.
The valleys between the mountains were full of green.
'Valles' here again refers to physical geographic features but emphasizes a recreational activity taking place in valleys.
Exploramos los valles en bicicleta durante el verano.
We explored the valleys by bicycle during the summer.
In this case, 'valles' is used metaphorically to compare the varying natures of technology and nature.