I recently came across a river with its riverbank tagged as `natural=coastline` for 12.2 miles (19.6 km) upstream of the actual sea. I spent some time and retagged the riverbank as a `waterway=riverbank', ([this edit]( https://www.openstreetmap.org/changeset/61959067)), only to be told that it was wrong for me to have done so. To clarify, there is no dispute over the location of the mouth of the river, as the way tagged `waterway=river` is unchanged, including its termination point. Previously the `waterway=river` way passed, as it was mapped, through a narrow sea channel for its final 12.2 miles. I have changed it so that the `waterway=river` is within `waterway=riverbank`s. Tagging riverbanks as coastlines is not something I've come across before, although I'm told it is the convention in the UK. In what situations is it appropriate? What are the advantages?advantages? **edit:** If this is a UK convention, is it documented anywhere?

I recently came across a river with its riverbank tagged as `natural=coastline` for 12.2 miles (19.6 km) upstream of the actual sea. I spent some time and retagged the riverbank as a `waterway=riverbank', ([this edit]( https://www.openstreetmap.org/changeset/61959067)), only to be told that it was wrong for me to have done so. To clarify, there is no dispute over the location of the mouth of the river, as the way tagged `waterway=river` is unchanged, including its termination point. Previously the `waterway=river` way passed, as it was mapped, through a narrow sea channel for its final 12.2 miles. I have changed it so that the `waterway=river` is within `waterway=riverbank`s. Tagging riverbanks as coastlines is not something I've come across before, although I'm told it is the convention in the UK. In what situations is it appropriate? What are the advantages?