a long trek

Translations
долгий поход
He went on a long trek through the mountains.
Он отправился в долгий поход через горы.
Definitions
A long trek refers to a lengthy and often challenging journey or hike, typically undertaken on foot, through difficult terrain or over considerable distances.
Words
a

article or possessive pronoun
один
long

adjective
долгий
trek

noun
поход