Technically, I think it was within the boundaries of Gondor. Some time after the Three Hunters left Parth Galen, we have this quote:
Quote:
The ridge upon which the companions stood went down steeply before their feet. Below it twenty fathoms or more, there was a wide and rugged shelf which ended suddenly in the brink of a sheer cliff: the East Wall of Rohan.
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TT p 15 (paperback)