Yes, I've seen that map too. It seems to indicate that the source is
in the municipality of Poncey-sur-l'Ignon. A 1:25k map will be more
precise, of course. But I don't think you are going to find any proof
of ownership on a topo map, though spot IS owned by Paris. But that
doesn't mean that it's part of the departement Ville de Paris (75). I
think it probably isn't. But you never know.

In the Netherlands we have the same thing: Amsterdam municipality owns
a large piece of the dunes on the Dutch coast (near Vogelenzang). It
is used as a filtration field for drinking water for the capital. But
the area is still part of other municipalities (Bloemendaal and
Zandvoort in the province of North-Holland, and Noordwijk and
Noordwijkerhout in the province of South-Holland).

Peter S.

--- In BoundaryPoint@y..., "Brendan Whyte" <brwhyte@h...> wrote:
> I checked French topo sheet #29, at 1:100 000 (Serie Verte) and
although the
> source and St Germain-sur-Seine are marked, there is no indication
of Paris
> City ownership. A commune boundary seems to follow the river for a
short
> distance from its source.
> Perhaps on a 1:25 ooo map?
>
> B
>
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