Réserve naturelle nationale de l'étang de la Mazière

The Réserve naturelle nationale de l'étang de la Mazière is a national nature reserve in the commune of Villeton, in the Lot-et-Garonne department of southwestern France, roughly midway between the towns of Agen and Marmande. Covering about 102 hectares, the reserve was established in 1985 thanks to the efforts of naturalist Alain Dal Molin. At its center lies a pond that formed as a cut-off meander of the Garonne river, a relic of the waterway's shifting course over time.

How did this landscape form?

The Étang de la Mazière sits within the alluvial plain of the Garonne, an area now dominated by intensive farmland. Over the centuries the river repeatedly changed its path, leaving behind abandoned channels — the pond at the heart of the reserve is one such remnant. Cut off from the main river flow, it gradually evolved into a self-contained wetland ecosystem, bordered by damp woodland and reed beds. This origin makes the reserve something of a living record of the river's history, illustrating how a valley's shifting hydrology shapes the natural habitats that follow.

What habitats and species live here?

The reserve forms a mosaic of distinct environments: the pond itself, damp woodland, reed beds, former gravel pits, and grazed fallow land. This variety of habitats makes Mazière an important site for water and marsh birds in the region. More than 230 bird species have been recorded here since the reserve's creation, and the breeding population alone includes over 70 species, among them the Eurasian golden oriole, the black kite, and the great reed warbler. The site serves both as a breeding ground and as a stopover for migratory birds, making it a rewarding location for observation throughout the year.

Beyond birds, the reserve also protects a rich community of reptiles and amphibians — 17 species in total, including the Mediterranean tree frog, the agile frog, the western spadefoot, and the European pond turtle, a species considered particularly vulnerable across the continent. The presence of such a diverse and sensitive fauna underlines the ecological value of this compact but biologically rich area.

How can visitors experience the reserve?

Given its protected status and the fragility of its habitats, the Mazière site is not open for unrestricted access. Schools, individual visitors, and specialized groups can enter, but only as part of guided visits led by a reserve warden, following a schedule set by the managing organization. The reserve operates year-round, though every visit must be booked in advance. This approach allows nature education and tourism to coexist with the protection of a delicate ecological balance.

Frequently asked questions

Where exactly is the reserve located? In the commune of Villeton, in the Lot-et-Garonne department of southwestern France, between the towns of Agen and Marmande.

When was the reserve created? In 1985, thanks to the initiative of naturalist Alain Dal Molin.

Can visitors explore the reserve on their own? No — access is only possible in organized groups, accompanied by a guide, and after booking in advance.

Which species stand out here? Among birds, the Eurasian golden oriole, black kite, and great reed warbler are notable; among reptiles and amphibians, the European pond turtle is considered especially significant.

How large is the reserve? Approximately 102 hectares.