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In the title complex, [La(C 5 H 3 N 2 O 2 )(C 2 O 4 )(H 2 O) 2 ]  n  , the La III  ion is coordinated by one N and three O atoms from two pyrazine-2-carboxylate ligands, by four O atoms from two oxalate ligands and by two O atoms of two water molecules, displaying a distorted bicapped square-anti­prismatic geometry. The carboxyl­ate groups of pyrazine-2-carboxyl­ate and oxalate ligands link the lanthanum metal centres, forming layers parallel to (10    ). The layers are further connected by inter­molecular O—H⋯O and N—H⋯O hydrogen-bonding inter­actions, forming a three-dimensional supra­molecular network.

Poly[diaqua-μ-oxalato-μ-pyrazine-2-carboxylato-lanthanum(III)]