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I found the following example sentence in my dictionary.
川沿いに歩く。Walk along a river.
I looked it up and found out that 川沿い is a noun. Then に should be a particle. But here clearly it doesn’t indicate the location of existence or the direction of motion. So what usage of に is this?
The phrase A沿いにB means "do B along A". It's commonly used with rivers, railway tracks, roads, anything long.
