alongside a railway line, bus route, major thoroughfare, etc.
川沿い【かわぞい】
along the river, riverside
沿海【えんかい】
coast, shore, inshore, coastal waters
沿う【そう】
to run along, to run beside, to stick to (a line), to follow (a policy, plan, etc.), to act in accordance with, to align with, to meet (wishes, expectations, etc.), to satisfy, to comply with, to live up to