This is the 656th most frequent Finnish word.
matkan
"Matkan" is the genitive or accusative form of "matka," meaning "of the journey" or "the journey" in English.
Here, 'matkan' is the genitive case of 'matka' indicating possession or association with 'varrella' (on the way), describing the location during travel.
Matkan varrella näimme kauniita maisemia.
On the way, we saw beautiful scenery.
'Matkan' in this sentence, as the genitive case of 'matka', functions as a descriptor for the phrase 'ajaksi tarkoitettu' (intended for the duration), specifying the time context of the proposed activity.
Minulla on mukava matkan ajaksi tarkoitettu kirja.
I have a book meant for the duration of the journey.
Here, 'matkan' is in the genitive form, used before 'varrella' (along) to express possession.