I ENJOY walking on the road parallel to the river.
The mouths of eight thirsty people are lined up in parallel on the water's edge.
|( に ) そ*う||
run parallel to, like a trail parallel to the edge of a lake, or a line of houses running alongside the train tracks.
|( xxxに ) そ＊って ( YYY )||
(a more figurative idiom): in accordance with XXX, we will do YYY.
|沿||run parallel to||NO ROOF|
So you bathe under a PEAKED ROOF for privacy.
Outdoors (i.e. where there is NO ROOF), you run parallel to the river.