More than 25 years seeking balance

Meet our history

We were born to conserve biodiversity and promote a balanced coexistence between humans and nature

Faced with the alarming situation of the environmental deterioration of their immediate surroundings, a group of people from different back- grounds (education, justice, environment) came together to work towards a common aim: to halt the negative consequences of urban development on biodiversity, quality of life and public health.


After its recovery, the marsh is now a natural oasis, shelter to a large number of aquatic birds.

Hace 20 años

Urbanisation reduced the vast and rich Alday marshland to a mere tenth of its original size: from 1000 ha. to only 75 ha.

Seeds of natural life

Green Belt of the Bay of Santander

The Alday Marshes, were the origin of the FNYH and the Green Belt of the Bay of Santander, consisting nowadays of ten nature reserves

The Bay of Santander, in Cantabria (northern Spain), is made up of different natural ecosystems such as intertid- al zones, islands, holm oak groves, small cliffs and wet- lands. In its recent history, this area has lost almost half its surface area, and it’s currently relegated to around 2,500 hectares, with only 80% of its original coastline re- maining. One of its most outstanding enclaves is the Al- day Marshes.

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The Green bBelt in figures


Protected nature reserves

0 ha.

of reclaimed land of relict holm oak groves

4,6 k

planted specimens of coastal heather

Sta. María Island

0 ha.

of land free of invasive species

How chamois and salmons returned to the mountain

The Pasiega and Eastern Mountains of Cantabria

Our actions in the Pasiega Mountains have reintroduced species that had disappeared from the area for centuries and reforested the area by planting more than 250,000 trees

The Pasiega and Eastern Mountains of Cantabria, Castile -León and the Basque Country (in northern Spain) include the headwaters of the Pas, Miera, Asón and Soba valleys. They also include the southern and eastern slopes of the Cantabrian massif, in the provinces of Burgos and Vizcaya, with the valleys of Trueba and Cantabria, respectively.

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The Pasiega mountains in figures

Agreements with
private farms
Agreements with
local councils
100 k

Trees planted

Oaks, birches, beeches and ash trees

0 M

CO2 litres reduced

A Spanish- Portuguese Biological Corridor

Iberian West

Campanarios de Azaba represents the recovery and conservation of the dehesa in all its splendour: all kinds of species of Mediterranean flora and fauna coexist with the human presence in perfect balance.

In the Iberian West, between Spain and Portugal, we find extensive woodlands formed by large oak, cork oak and cork oak trees in territories in symbiosis with human activity. It is a cross-border natural area be- tween Spain and Portugal, comprising the Spanish provinces of Salamanca, Zamora and Cáceres and covering some 2.5 million hectares. It is a large eco- system made up of mountain ranges, river canyons, cereal steppes, rivers and vast expanses of meadows and Mediterranean scrubland.

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Iberian west in figures

10000 km2

The cross-border Iberian plateau

Biosphere Reserve


500 ha.

1st Entomological Reserve
in Spain


natural parks



12000 ha.

Private farms

Practising habitat conservation with the help of FNYH

The SDGs in our conservation projects

Our activity with the Sustainable Development Goals (SDGs) of the United Nations 2030 Agenda for all the areas of work contained in this report of 25 years of activity.

Sustainable Development Goals
Sustainable Development Goals Green Belt
Sustainable Development Goals Pasiega mountain
Sustainable Development Goals Iberian West

Impact reports