It's one body of water, so I would create one multipolygon for the whole
reservoir. Data providers should be able to deal with things crossing
administrative boundaries, it happens with all sorts of objects.
Note that the user who did this made chunks of areas over the water--maybe
to avoid the 20
I noticed that some islands within Pymatuning Reservoir
ttps://www.openstreetmap.org/#map=12/41.6074/-80.5203 , a large reservoir that
cuts across the Ohio and Pennsylvania borders for 8 miles, weren't
visible on the main map layer and was going to trace them.
The islands were tagged natural=land,
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