a long journey
peregrination - journey
The formal word ‘peregrination’ expresses travelling extensively or wandering from place to place for an extended period of time. It also implies that a lot of the journey is done on foot. Therefore you would not refer to a weekend away somewhere as a peregrination, but backpacking around Asia most certainly would be.
John used his severance pay to go on a peregrination throughout India which lasted nearly a year.
Julie likes to peregrinate, which is why she decided to pursue a career as a photojournalist.
Sat bored in the office, I went on a mental peregrination and imagined hiking the Appalachians.