H2O as a monodenate ligand

[WYacob_2C]

Why is H2O a monodenate ligand? When you draw the lewis structure of H2O, the oxygen has two lone pairs, but the molecule as a whole is classified as a monodenate. Could someone explain this to me. Thank you in advance.

[Zaynab Hashm 2I]

I believe it's because both lone pairs are on the same (one) oxygen atom, so there would only be one binding site for the metal (since in this case, the metal would only bind to one atom)