51區被昵稱為水城（watertown）、夢境（dreand）、天堂牧場（paradise ranch）、農場（the farm）、盒子（the box）、格魯姆湖（亦名馬夫湖grooke）、發展計劃董事會區（the directorate for development ns area），是著名的“外星研究基地”。
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