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The asymmetric unit of the binuclear centrosymmetric title compound, [Er2(C12H14O4)2(C12H15O4)2(C12H8N2)2(H2O)2]·2H2O, contains one ErIII atom, one coordinated water molecule, one 1,10-phenanthroline (phen) ligand, two differently coordinated adamantane-1,3-dicarboxylate (H2L) ligands and one lattice water molecule. The ErIII ion is eight-coordinated by four O atoms from bridging L2−, one O atom from HL−, one O atom from the coordinated water and two N atoms from a phen ligand. Extensive O—H...O hydrogen-bonding interactions result in the formation of chains which are further linked into a layer-like network by π–π stacking interactions centroid–centroid distance = 3.611 (3) Å] between adjacent phen ligands belonging to neighbouring chains. The carboxy group of the HL− ligand is equally disordered over two positions.