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The anode region is on the iron where the following reaction occurs: $$\ce{Fe(s) -> Fe^2+(aq) + 2e-}$$

and at the cathode region, the following reaction occurs $$\ce{O2(g) + 4H+(aq) + 4e- -> 2H2O(l)}$$

However, the textbook does not explicitly state what the cathode region is. Can someone provide an answer?

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I would assume that the cathode region is a source of $\ce{O2(g)}$, which is probably the air in contact with the iron. Therefore the reacting should occur at the interface iron/air.

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    $\begingroup$ There's a pretty good diagram of the process here. Where the reduction reaction actually occurs basically depends on where the oxygen can reach the metal. $\endgroup$ – Michael DM Dryden Nov 27 '14 at 17:47

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