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The present paper is devoted to developing relations between Galois \'etalecoverings in codimension 1 and \'etale fundamental groups in codimension 1 ofalgebraic varieties, aimed to studying the topology of Mori dream spaces. Inparticular, the universal \'etale covering in codimension 1 of a non-degeneratetoric variety and a canonical Galois \'etale covering in codimension 1 of aMori dream space (MDS) are exhibited. Sufficient conditions for the latterbeing either still a MDS or the universal \'etale covering in codimension 1 aregiven. As an application, a canonical toric embedding of K3 universalcoverings, of Enriques surfaces which are Mori dream, is described.

\'{E}tale coverings in codimension 1 with applications to Mori Dream Spaces