[Feature Request] Add water boundaries

[janik6n]

For cities located next to lakes, rivers or ocean, adding water boundaries would complement the resulting map nicely. Could be an option to turn on/off in the Customize render settings.

[anvaka]

I like this suggestion. Does anyone know what would an overpass query look like for something like this?

cc @RicoElectrico

[mlcampbe]

I'd love to see this feature as well. As it is now the water sections are blank just like land without any roads. Would be great to see water filled it with a custom selectable color.

[keunes]

Just read about this tool - it's really nice. We live in a water-rich country. It would be great if we would be able to select a specific colour for water, like we already can for background and routes.