～の横

About

The noun 横よこ can be used locationally to say that something is "beside" a given location.

Since 横よこ is a noun, we can use the の particle to attach it to another locational noun.

E.g. パソコンの横よこにリンゴがあります。
"There is an apple beside the computer."

～の横よこ can be followed by the に particle as above, or the の particle, which creates a nominalized "noun phrase". Other particles, such as で or は are also possible depending on the sentence.

E.g. パソコンの横よこ のリンゴがおいしい。
"The apple beside the computer is delicious."

Unlike 前まえ and 後あと, 横よこ does not have a temporal usage.

Summary

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  ～の横よこ attaches to a noun to express "beside (noun)"

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  (location)の横よこ can nominalized by the の particle