Skis
A crevice.
A long narrow region is often referred to as a strip or a corridor.
Very narrow but a little over 1 foot long.
Fjords.
A long narrow chain of hills and mountains is called a mountain range or a mountain chain.
A long narrow cut could be called a gash or a slash, depending on the context or severity of the wound.
fjord fjord
That could be cross country skis.
Foot. It was a series of stops. Not a real train.
ria
3 months
By foot 4-6 months