Answer
What depth should a wildlife pond be?
Varied: shallow shelving margins plus a deeper central zone, around 60cm or more, for over-wintering life.
In short
A wildlife pond works best with varied depth: gently shelving shallow margins for plants and easy access for creatures, and a deeper central zone, around 60cm or more, that stays cool and frost-free for life over winter. The varied profile is what makes it a habitat rather than just water.
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