Legal precedent
Roybon: the Center Parcs abandoned after 13 years
In 2020, the Center Parcs project at Roybon (Isere) -- 202 hectares, EUR 387M -- was abandoned after 13 years of legal and citizens' struggle. This precedent is directly applicable to Europa Valley, with even stronger arguments.
"We were at a dead end, it had become inextricable between the site occupation, regulatory changes, permits for construction, deforestation, the water law, species protection, and the slowness of the courts... Everything was piling up, it was endless."
Point-by-point comparison
Two projects, two territories -- but similar stakes and even stronger protections in Alsace.
| Criterion | Center Parcs Roybon | Europa Valley |
|---|---|---|
| Project type | Tourist complex (1,000 cottages, aquatic dome) | Hotel/leisure complex (hotels, Europa-Park link) |
| Area | 202 hectares | 60 to 250 hectares depending on source |
| Investment | ~EUR 387M | Not disclosed (total opacity) |
| Habitats affected | Forested wetlands (Chambaran) | Alsatian Ried (wetlands, farmland) |
| Developer | Pierre & Vacances (listed company) | Mack family / Mack One (family business) |
| Political support | Isere departmental council (Vallini) | CEA (Bierry), ADIRA, local officials |
| Natura 2000 | 1 km from the site | Directly adjacent (SAC within project municipalities) |
| Ramsar | Not applicable | Ramsar site |
| ZAN law | Did not exist yet | Applicable (2021 law) |
| Farmland | Mainly forest | Active farmland |
| Duration of fight | 13 years (2007-2020) | Ongoing since ~2018 |
| Outcome | Abandoned (July 2020) | Ongoing |
Why Europa Valley is more vulnerable than Roybon
Six additional arguments that did not exist or were weaker in the Roybon case.
Natura 2000 in immediate proximity
At Roybon, the Natura 2000 site was 1 km away -- and the argument still won in court. For Europa Valley, the SAC 'Rhin-Ried-Bruch' (20,086 ha) covers natural habitats within the municipalities of Diebolsheim and Sundhouse themselves, directly adjacent to the project site. The impact assessment will be even more demanding.
Ramsar Convention
The Ried is a Ramsar site (wetland of international importance). This argument did not exist at Roybon. Although the convention is not directly enforceable, it considerably strengthens the demonstration of the site's ecological importance.
ZAN Law (2021)
The Zero Net Artificialisation objective did not exist at the time of Roybon. Artificialising 60 to 250 hectares is hardly compatible with the trajectories imposed by this law.
Obvious wetlands
The Ried is a recognised wetland (floodable meadows, shallow groundwater, hygrophilous vegetation). Characterisation will be easier than in the Chambaran forests, where the battle of experts lasted years.
Established case law
The Roybon decisions (Administrative Tribunal of Grenoble 2015, Administrative Court of Appeal of Lyon 2016, Council of State 2017-2020) now constitute solid case law that can be relied upon directly.
Food sovereignty
The project affects active farmland, not forest. The food sovereignty argument and support from the Confederation Paysanne (farmers' union) add an angle that was absent at Roybon.
The 3 pillars of the Roybon victory
It was not a single lever but the combination of all three that made the project "inextricable".
Legal action
Multiple simultaneous legal challenges against all documents: SCoT, PLU, water law, protected species, deforestation, Natura 2000. It was the multiplication of angles of attack that made the project 'inextricable'.
Ground occupation (ZAD)
6 years of occupation (2014-2020), 15 to 30 people permanently. Physically prevented construction from starting while legal challenges ran their course. The expiration of the deforestation permit sealed the abandonment.
Citizens' mobilisation
Demonstrations of 1,000 people, coverage by Reporterre, Basta!, Le Dauphine, France 3. National coordination CP-NINA (Center Parcs Neither Here Nor Anywhere).
Key court decisions
The rulings that set precedent and on which the fight against Europa Valley can build.
Annulment of the prefectoral water law order
Insufficient and dispersed compensatory measures (16 sites across 5 departments instead of the same sub-basin). Non-compliance with the Rhone-Mediterranean SDAGE (200% compensation requirement).
View the decisionAnnulment for inadequate Natura 2000 assessment
The Natura 2000 impact assessment was insufficient even though the site was only 1 km away. For Europa Valley, the Natura 2000 zone is directly adjacent to the project -- the assessment requirement will be even stronger.
View the decisionDefinition of wetlands (cumulative criteria)
Soil AND vegetation criteria were cumulative -- restrictive. But the law of 24 July 2019 restored alternative criteria (soil OR vegetation is sufficient), in favour of environmental defenders.
View the decisionRejection of constitutional challenge on wetland definition
Confirmation of the constitutionality of the 2019 law: a single criterion (soil or vegetation) is sufficient to characterise a wetland.
ZAN and urban planning case law
Recent decisions that strengthen the arguments against Europa Valley on the ground of artificialisation.
Constitutionality of the ZAN law confirmed
The Council of State confirms the constitutionality of the ZAN framework (Climate and Resilience Act 2021). The objective of reducing artificialisation by 50% by 2031 and achieving zero net artificialisation by 2050 is legally enforceable.
Full annulment of the Pays de Maurienne SCoT
Annulled for tourism development contradicting the SCoT's own environmental objectives. Directly applicable to Europa Valley: a SCoT cannot promote a project of massive artificialisation while displaying environmental protection objectives.
View the decisionEuropa Valley absent from national mutualisation
The Europa Valley project does not appear on the list of 424 nationally significant projects whose land consumption is mutualised at the national level. Its consumption of 60 to 250 hectares would therefore be entirely charged to the Grand Est region's budget -- a major burden for the region.
Huwart Law (26 Nov. 2025): unlimited illegality exception
The law of 26 November 2025 repeals article L.600-1 of the urban planning code which limited to 6 months the time for raising the illegality exception of a planning document. Henceforth, the illegality of a SCoT or PLU can be invoked without time limit -- an additional lever against the SCoT amendment favouring Europa Valley.
The Avoid-Reduce-Compensate sequence: the trap for developers
The Avoid-Reduce-Compensate (ERC) sequence was at the heart of Roybon's failure. It applies identically to Europa Valley.
Avoid
The developer must demonstrate that alternative locations were seriously explored. At Roybon, this demonstration was insufficient. For a project in the heart of the Ried -- Natura 2000, Ramsar, farmland -- it will be even more difficult.
Reduce
Reduction measures must be proportionate to the impact. A 60 to 250 hectare project on active wetlands makes this proportionality nearly impossible to achieve.
Compensate
The Rhine-Meuse SDAGE requires 200% compensation in the same sub-basin. At Roybon, dispersal across 16 sites in 5 departments led to annulment. Finding 120 to 500 ha of local compensation will be a major challenge.
What Roybon teaches us
Mistakes to avoid and strategies that have proven effective.
What worked
- -Multiplying legal angles of attack (water law + Natura 2000 + species + urban planning)
- -Combining legal action with citizens' mobilisation
- -Commissioning independent counter-studies on wetlands
- -Challenging planning documents as early as possible (SCoT, PLU)
- -Participating massively in public inquiries and documenting deficiencies
- -Playing the long game: 13 years of proceedings exhausted the developer
Mistakes to avoid
- -Do not neglect legal action in favour of direct action alone
- -Do not wait for permit applications to prepare (inventories, studies)
- -Do not underestimate tailor-made regulatory changes (cf. 2018 decree extending deforestation for Pierre & Vacances)
- -Do not spread too thin: prioritise the strongest legal challenges
Sources & legal references
Roybon was abandoned. Europa Valley can be too.
The environmental protections of the Ried are even stronger than those of Chambaran.