What does ''formal" mean in "formal park" phrase? Here is an excerpt:
Now to the Bicentennial Park itself. It has two areas, a nature reserve and a formal park with man-made features and gardens.
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Sign up to join this communityIt talks about two distinct areas. One which is natural and the other that is manmade i.e. developed according to the plan.
OALD has this definition.
formal - (of a garden, room or building) arranged in a regular manner, according to a clear, exact plan
Formal park is similar in meaning to formal garden, which suggests an elaborate, precise, and carefully designed layout.
A Google Images search for "garden" and "formal garden" should give you an idea.