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The novel pentaborate with a transition-metal complex as counter-cation and with water of crystallization, tris(ethylenediamine)cobalt(II) bis[4,4′,6,6′-tetrahydroxy-2,2′-spirobi(cyclotriboroxane)(1−)] dihydrate, [Co(C2H8N2)3][B5O6(OH)4]2·2H2O, forms a three-dimensional supramolecular framework through O—H...O hydrogen bonding among the [B5O6(OH)4]− anions with large channels along the a axis in which the templating [Co(en)3]2+ cations (en = ethylenediamine) and water molecules are located. The crystal packing is consolidated by additional O—H...O and N—H...O hydrogen bonds.