Hey mappers,
Recently, there’s been some confusion about editing water features in Google Map Maker. This was due, in part, to an outdated post on the Map Maker General forum on naming water features, which is not in line with the policy guidelines on Help Center.
The correct approach for mapping water features: If you're mapping a river, then it's fine to have names for both of the features (polyline and polygon).
Also, if there's no polyline within the (river) polygon already, there's no need to add one.
We hope this this clarifies the situation. Please let us know if you have further questions.
Thanks!