他家在海邊上。What function does 上 have in this sentence?

"His house is on the seaside," but what role is 上 playing in the sentence?

"His house is up along the seaside?"

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from r/ChineseLanguage: a community for people who are studying, teaching, or interested in Chinese! https://www.reddit.com/r/ChineseLanguage/comments/9nzpmy/他家在海邊上what_function_does_上_have_in_this_sentence/

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