The Mar Menor's Recovery: Legal Rights, Investment and Buyers

The Mar Menor is recovering with serious backing. Under Ley 19/2022 it became the first ecosystem in Europe to hold legal rights, upheld by Spain's Constitutional Court in 2024. The state is investing around €675 million in restoration through 2027. For buyers, that means a protected, well-funded lagoon on the doorstep.

The Mar Menor is one of the great attractions of living in the Region of Murcia: Europe's largest saltwater lagoon, with calm, shallow, warm water, 20-30 minutes from the golf resorts. After water-quality episodes in recent years, it is now the focus of one of Spain's most ambitious environmental recovery efforts. Here is what that means if you are buying nearby.

Santiago de la Ribera, with its long seafront promenade and wooden bathing piers, is a lovely place to start.

What does legal personhood for the Mar Menor mean?

Ley 19/2022, passed on 30 September 2022, gives the Mar Menor and its watershed legal personality. It was the first law of its kind in Europe, and it came from a citizens' popular legislative initiative backed by more than 600,000 signatures, a measure of how much local people care about their lagoon.

The law recognises the lagoon's rights to exist, to evolve naturally, and to be protected, conserved and restored. It is represented by a three-part guardianship structure: a committee of representatives, a monitoring commission and a scientific committee.

In practice, the lagoon can now be represented in court in its own right. Any citizen or organisation can act on its behalf, which gives the Mar Menor a level of legal protection few places in the world enjoy.

Is the Mar Menor law still in force?

Yes. The law was challenged at the Constitutional Court, and the challenge was rejected in judgment STC 142/2024, handed down by the full court on 20 November 2024. Ley 19/2022 has been through Spain's highest constitutional authority and it stands.

How much is being invested in restoring the Mar Menor?

A great deal. The Spanish government's Marco de Actuaciones Prioritarias para la Recuperación del Mar Menor (MAPMM), run by the environment ministry (MITECO), has a budget of around €675 million through 2027. It was expanded from an initial €484 million in April 2024 and has been described as Spain's largest environmental investment in a single ecosystem.

The programme has also been recognised by the United Nations as a World Restoration Flagship.

For anyone buying in the area, this is a region putting real money and law behind protecting its most famous natural asset.

What does it mean for buyers near the Mar Menor?

For most buyers, the effect is positive and indirect. A lagoon with legal rights, a scientific committee watching over it and hundreds of millions of euros of restoration under way is a lagoon with a better long-term future. That supports the beach towns, the lifestyle and, over time, the appeal of the whole area.

The personhood law itself does not restrict building. Nothing in Ley 19/2022 imposes a building moratorium.

Planning in the watershed is handled by a separate law, Ley 3/2020 on the recovery and protection of the Mar Menor. It sets zones across the Campo de Cartagena and, until the region's territorial plan for the watershed is approved, a temporary exclusion area for new urban developments that had not received initial approval before 2020. It does not affect consolidated urban land or developments already in the pipeline at that point. Your lawyer checks this as a standard part of due diligence on any specific plot. We introduce you to independent, English-speaking lawyers who do this work routinely, and you are always free to choose your own.

What should I ask my lawyer?

Buying in Spain is straightforward when your lawyer checks the right things. For a home near the Mar Menor, ask them to:

• Confirm the planning status of the specific development and plot, including how Ley 3/2020 applies.
• Confirm the development's building licence and, for off-plan homes, the deposit protection under Ley 20/2015.
• Check the flood map for the specific address, which is a routine check anywhere near the coast.

We guide you through each step, from reservation to completion and handover.

Can you swim in the Mar Menor?

Yes. Its shallow, warm water is popular with families every summer, and towns such as Los Alcázares, San Javier and Santiago de la Ribera are busy through the season. The regional government publishes current bathing-water information, and if you fancy a change, the Mediterranean beaches of La Manga and the Costa Cálida are close by.

FAQ

What is the Mar Menor law?

Ley 19/2022 gave the Mar Menor and its watershed legal personality, making it the first ecosystem in Europe with its own legal rights. The lagoon has rights to exist, evolve naturally and be protected, conserved and restored.

Is the Mar Menor's legal personhood still valid?

Yes. Spain's Constitutional Court rejected a challenge to Ley 19/2022 in judgment STC 142/2024 on 20 November 2024, so the law stands.

How much is being spent on restoring the Mar Menor?

The state's recovery programme (MAPMM) has a budget of around €675 million through 2027. It funds a Green Belt of filtering wetlands, Sierra Minera restoration, flood protection, dune restoration on La Manga and the removal of the abandoned Puerto Mayor marina structures.

Does the Mar Menor law stop building nearby?

No, Ley 19/2022 imposes no building restrictions. Planning for new developments in the watershed is covered by Ley 3/2020, and your lawyer checks how it applies to a specific plot as part of normal due diligence.

Can I swim in the Mar Menor?

Yes, it's a popular summer swimming spot for families. The regional government publishes current bathing-water information, and the open Mediterranean beaches are close by too.

Come and see it for yourself

The Mar Menor is 20-30 minutes from the golf resorts we sell, and it's well worth an afternoon on your viewing trip. If you'd like to see the resorts for yourself, I'd love to show you round. Message me on WhatsApp on +44 7424 864 684 or send an enquiry and I'll get straight back to you.

This article is general information, not legal or financial advice. Confirm your own position with a qualified Spanish lawyer or tax adviser before you act.

About the author — Lee Doherty is the founder of MedSol Real Estate. He spent two years researching the region before buying here himself, and now helps UK and international buyers find golf-resort homes across the Region of Murcia.