Rauarahu on 368 m² suurune saar Väinameres Heinlaiust 1 kilomeeter lõunas, halduslikult Hiiu maakonnas Hiiumaa vallas Sarve küla alal.
Rahu rannajoone pikkus on 102 meetrit.
Saar on liivase pinnamoega, kuulub Väinamere hoiuala koosseisu ja on looduskaitse all.
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