Flói

Flói Nature Reserve protects approximately 4,000 hectares of coastal wetlands and lowland meadows in southern Iceland between the rivers Ölfusá and Þjórsá, representing one of Iceland's most important breeding grounds for migratory wading birds and waterfowl. The reserve encompasses a flat landscape of marshes, shallow lakes, wet grasslands, and drained meadows that collectively support extraordinary bird diversity during the summer breeding season. The area's significance extends beyond Iceland as a critical site within the East Atlantic Flyway, with birds breeding here migrating to western Europe and Africa for winter. Flói demonstrates the importance of Iceland's lowland wetlands for continental-scale bird conservation.

The wetlands support one of Iceland's densest breeding populations of wading birds, with black-tailed godwit, whimbrel, redshank, snipe, golden plover, and dunlin all nesting in significant numbers. Greylag geese breed abundantly in the marshes, while whooper swans utilize the shallow lakes for nesting. Short-eared owls hunt across the reserve, and merlin nest in surrounding areas, preying on the abundant smaller birds. The reserve's shallow waters and wet meadows provide ideal feeding habitat for chicks of multiple species, making it a critical nursery area.

Wet grasslands dominated by sedges, cotton grass, and various moisture-tolerant grasses form the primary vegetation, maintained in its open character by the high water table and seasonal flooding. Shallow lakes and pools support aquatic plants including pondweeds and aquatic buttercups, with emergent vegetation along margins providing nest cover. Mosses form significant ground cover in the wetter areas, while slightly elevated ground supports grass-heath communities. The flat terrain and uniformly wet conditions create a relatively homogeneous vegetation pattern that favors ground-nesting birds requiring open sightlines for predator detection.

The reserve occupies a coastal lowland plain composed of Holocene-age sediments deposited by the rivers Ölfusá and Þjórsá during thousands of years of flooding and sedimentation. The flat terrain barely rises above sea level, with the water table at or near the surface creating the permanently wet conditions that define the landscape. Underlying the recent alluvial deposits are layers of tephra from historical volcanic eruptions, providing datable marker horizons within the sedimentary sequence. The ongoing subsidence of Iceland's southern lowland, combined with sediment deposition from glacial rivers, continues to shape this dynamic coastal plain.

The southern Iceland coastal location provides relatively mild conditions with average temperatures from 0 degrees in January to 11 degrees in July, moderated by proximity to the North Atlantic. Annual precipitation exceeds 1,000 millimeters with frequent rainfall throughout the year. The flat, open terrain is fully exposed to winds, with southerly storms bringing particularly wet conditions. The combination of mild oceanic climate and wet conditions creates a long growing season that supports the productive grassland ecosystem essential for breeding birds.

The Flói lowlands have been utilized for agriculture since Iceland's Norse settlement, with the fertile alluvial meadows providing valuable haymaking land. Traditional farming relied on the seasonal flooding to fertilize the grasslands, with hay harvested in late summer providing critical winter fodder for livestock. Drainage ditches dug from the 18th century onward partially converted wetland to drier pasture, altering but not eliminating the wetland character of much of the area. The agricultural community maintained the open grassland character that benefits breeding birds, creating a cultural landscape of conservation significance.

Growing awareness of the area's ornithological importance led to nature reserve designation protecting the most significant breeding habitats from further drainage and development. The reserve recognizes that centuries of low-intensity agricultural use created and maintained the habitat conditions that support current bird populations. Management works with farmers to maintain appropriate grazing and mowing regimes that prevent scrub encroachment while respecting breeding seasons. The site's inclusion in international designations including Important Bird Area status emphasizes its significance beyond Icelandic borders.

Birdwatching represents the primary visitor activity, with the reserve's accessible location and exceptional diversity attracting both Icelandic and international birders. Observation points allow viewing of breeding waders and waterfowl from May through July without entering sensitive nesting areas. The flat terrain and farm tracks provide easy walking access to different habitat types within the reserve. The spectacular density of displaying waders during May and June creates one of Iceland's most impressive wildlife spectacles.

The reserve is located approximately 60-70 kilometers from Reykjavik in the southern lowlands, accessible by paved roads from Route 1. No formal visitor center exists, but information boards at access points provide maps and bird identification guides. The flat terrain allows easy walking, though rubber boots are essential for the perpetually wet ground. Accommodation is available in nearby towns including Selfoss. The breeding season from May through July provides the most rewarding visiting period for birdwatchers.

Preventing further drainage of remaining wetlands is critical, as historical land reclamation has already reduced the area of suitable breeding habitat. Predator management, particularly of non-native mink and expanding Arctic fox populations, protects vulnerable ground-nesting birds. Agricultural intensification including earlier mowing dates can destroy nests and chicks before fledging, requiring coordination with farmers on appropriate timing. Climate change may alter the hydrological regime through changing precipitation patterns and river flow dynamics, potentially affecting the wet conditions essential for the breeding bird community.