#3
For me, i'd choose the above plan #3 due to the fact it's much more practical and the width of the "river" does not constrict any flow and aesthetically it'd be nice from high elevation to low elevation.
Also, just to add, it has a nice arc from the rear right up to the front and it separates both land areas just nicely in terms of prorportions. Might want to add a fallen log across just in case mr Froggie wants to migrate from one land to another.
Regards,
Phillipe.
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