>> DEEP VALLEYS

In this case, the phrase "deep valley" is directly appended to the word "moyo", which clarifies the intent enormously.

This is from a Tengen title-match game between Kono Rin (Black) and Yamashita Keigo in 2007.

In the game White played White 32 at A. Kono (who won) remarked that it might seem blindingly obvious to play instead at White 1 as in the diagram, but if he did, Black would continue as shown and then White would be troubled by the likelihood of Black's forcing move at B, which would make "the moyo's valley deep". Although it would be easy to argue that there's not much of a valley shape, or that what there is is hardly deep, it does seem clear here that valley is intended as geography and not as metaphor.

© John Fairbairn & T Mark Hall (GoGoD), London 2011.