Tjärnö Island

5 (11)

Serene island gateway to Sweden's oceanic frontier, where Kosterfjord's deep reefs and rich biodiversity meet tranquil shores and marine science heritage.

Home
Sweden
Bohuslan
Tjärnö

Tjärnö Island, connected by bridges to the mainland near Strömstad, Sweden, offers serene coastal beauty within the Kosterhavet Marine National Park. Home to the renowned Tjärnö Marine Biological Laboratory, it features pristine waters teeming with marine life, rocky shores, eelgrass meadows, and deep fjords harboring cold-water coral reefs. Ideal for nature lovers seeking tranquil hikes, sea views, and insights into Sweden's richest oceanic biodiversity, where over 6,000 species thrive in this unique Skagerrak environment.

A brief summary to Tjärnö

Strömstad, SE
Free
Outdoor
Mobile reception: 4 out of 5

Local tips

Visit in summer for public access to Tjärnö Aquarium's live marine displays and guided lab tours.
Bring binoculars for seal spotting along rocky shores and sounds.
Check weather forecasts for optimal coastal walks, as winds influence sea clarity.
Pack layers for variable microclimates between sunny hills and misty fjords.

Do you manage this location?

Take control to get all the benefits, like improved information, better appearance, and stronger visibility across AI-powered discovery. Learn more

Activate your presence

Other nearby places you may find interesting

Entrance Tjärnö / Saltö

Discover the Natural Wonders of Tjärnö and Saltö National Reserve

Grönlandval Femstenaberg

Naval mines monument

Naval Mines Monument

Getting There

Car

Drive from Strömstad center 14 km north via coastal road to Tjärnö bridges, 15-20 minutes; free roadside parking available but limited in peak summer.
Bus

Västtrafik bus 863 from Strömstad bus station to Tjärnö stop, 25-35 minutes, runs hourly weekdays and weekends, single ticket 40-50 SEK.
Taxi

Taxi from Strömstad train station or harbor, 15-25 minutes depending on traffic, costs 250-400 SEK for up to 4 passengers.
Bicycle

Cycle from Strömstad along dedicated coastal path, 45-60 minutes on mostly flat terrain with some gentle inclines, bike rentals available in town for 100-150 SEK per day.

For the on-the-go comforts that matter to you

Restrooms
Drink Options
Food Options
Seating Areas
Trash Bins
Information Boards

Discover more about Tjärnö

Gateway to Oceanic Depths

Tjärnö Island sits on the eastern edge of the Kosterfjord, a dramatic 247-meter-deep fissure that links directly to the North Sea and Atlantic Ocean. This connection brings oceanic salinity to Swedish waters, creating the nation's only true oceanic habitat. Rocky shores give way to narrow sounds with swift currents, while shallow bays host eelgrass meadows swaying in the tidal flow. The island's compact landscape invites exploration on foot, revealing hidden coves and panoramic vistas across the archipelago.

Hub of Marine Discovery

Since 1963, the Tjärnö Marine Biological Laboratory has anchored the island's scientific legacy as part of the University of Gothenburg. Researchers delve into marine ecology, biodiversity, and chemical ecology amid habitats rich in sponges, sea-pens, and Lophelia coral reefs. The lab's vessels and submersibles access deep-water sites just minutes away, supporting studies on over 6,000 marine species—more than 200 unique to Swedish coasts. This blend of research and nature defines Tjärnö's intellectual allure.

Biodiversity Hotspot Unveiled

Kosterhavet Marine National Park, Sweden's first marine-focused reserve established in 2009, envelops the island. Harbor seals bask on nearby rocks, while the fjord's depths shelter continental slope species rarely seen elsewhere in the country. Eelgrass beds nurture juvenile fish, and exposed coastlines withstand North Sea swells. Seasonal shifts bring vibrant algal blooms in summer and crisp clarity in winter, showcasing the Skagerrak's dynamic ecosystems.

Serene Island Rhythms

Bridges link Tjärnö seamlessly to the mainland, 14 km south of Strömstad, fostering a peaceful retreat amid Bohuslän's rugged coastline. Sunny elevations offer sweeping sea views toward the Koster Islands, with private jetties for swimming. The air carries salt-tinged breezes, mingled with pine from surrounding shores. Quiet paths wind past holiday homes, evoking timeless Scandinavian simplicity.

Seasons of Coastal Splendor

Summer awakens the island with long daylight for fjord explorations, while autumn paints shores in golden hues. Winter's calm reveals submerged wonders through clearer waters, and spring heralds migratory returns. Constant deep-water renewal ensures year-round vitality, monitored by local buoys tracking salinity, temperature, and oxygen from surface to abyss.