珍珠灣區(英語:Margaritifer Sinus quadrangle)是美國地質調查局太空地質學研究計劃(Astrogeology Research Program)對火星表面劃分的30個區域之一,編號為MC-19。[1]
珍珠灣區覆蓋了火星西經0°至45°、南緯0°至30°的區域。機遇號2004年1月25日在火星上的着陸點(1.94°S,354.47°E)便位於該區。
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