The lagoon "canals" are connected to both rivers and the city "canals" in
the sense that the lagoon "canals" are often the continuation of rivers or
city "canals".
Two Examples:

   - Fiume (River) Dese (https://www.openstreetmap.org/way/27658040) and
   Canale Dese (https://www.openstreetmap.org/way/398995928)
   - Rio dei Giardini (https://www.openstreetmap.org/way/171899879) is a
   single way that is part canal and part nautical channel.






On Sun, 1 Jul 2018, 13:18 Martin Koppenhoefer, <[email protected]>
wrote:

>
>
> sent from a phone
>
> > On 1. Jul 2018, at 11:39, Volker Schmidt <[email protected]> wrote:
> >
> > No, my question was not about the canali in Venice, which are
> essentially waterways between islands that are inhabited.
>
>
> still there are some question for those “canals” in Venice: are they
> “artificial”, or are the islands (as you call them) artificial, or are both
> in principle natural with some human intervention and maintenance? Maybe
> some are artificial but most of natural origin? The Canale Grande is a
> channel or a canal? Wouldn’t it have to be artificial in order to be a
> canal?
>
>
> We don’t tag rivers as canals, although the current bed might have been
> shaped significantly by human intervention, so I guess man_made vs. natural
> for waterways is not meant to focus on the details rather than the overall
> picture
>
> Cheers,
> Martin
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