The standard arrival is by land to Stromstad on Sweden's west coast, then a passenger ferry from Norra Hamnen to a Koster pier. Kosterlinjen has operated the service on Vasttrafik's behalf since the September 27, 2026 timetable change. The normal crossing is approximately 40-60 minutes depending on the landing quay. Check line 899 and, in the summer period, additional 898 for Ekenas/Kilesand. Current operator; 2026 service change.

Gothenburg Landvetter (GOT) is a practical Swedish international airport for onward rail/bus or car travel. Oslo Gardermoen (OSL) is a Norwegian alternative with onward road or public transport via the border; Sandefjord/Torp (TRF) can be considered with a separate Sandefjord-to-Stromstad ferry crossing. These are access choices, not claims of nonstop flights or fixed airport transfer times. Regional transport information; .

The main Swedish international air gateway for a road or multi-leg bus/rail connection north to Stromstad. No specific airline, direct service or journey time is claimed because those depend on the travel date. Regional public transport guide.

A cross-border air alternative in Norway for onward land travel to Stromstad; entry documentation and border transport must be planned separately. Regional arrival information.

Norwegian alternative for travellers choosing a land transfer to Sandefjord, then the separate Color Line passenger ferry to Stromstad. The ferry crossing itself is approximately 2.5 hours. Ferry operator facts.

On the Koster islands, travel is primarily on foot and by permitted bicycle. The park and adjacent reserve prohibit cycling off roads. The public ferry docks at several piers, so choose a landing near your accommodation, naturum or dive rendezvous. The September 2026 Vasttrafik notice allows bicycles aboard free subject to capacity, while kayaks and freight may have different conditions. Current bicycle guidance; Cycling rules.

Do not rely on a car to cross to Koster: the passenger islands are car-free for visitors. In summer, a cable ferry can help visitors connect Nordkoster and Sydkoster; at other times use scheduled passenger-ferry stops when applicable. The region also has road-accessible mainland park entrances at Salto, Rosso and Reso. Island connection; Entrances.

Sweden is in the Schengen Area. EU and EEA travellers have different free-movement and identification arrangements from non-EU visitors. Many non-EU nationalities may visit short term without a visa, while others must obtain a Schengen visa in advance; short-stay rules usually apply across the Schengen Area for up to 90 days in any 180-day period. Residence status, passport validity and other entry requirements depend on nationality and itinerary. Check the Swedish Migration Agency before travel.

Travel via Norway may involve separate transport-operator ID requirements despite both countries participating in Schengen. Color Line asks travellers to have valid identification and a booking reference. Color Line check-in rules.

For scuba, bring a certification card and evidence of relevant recent cold-water/boat experience. Check with the actual club or operator for cylinder availability, air quality, Nitrox, regulator and suit hire, weights, dive computers, cylinder transport, storage and equipment maintenance. The old Trident page does not prove 2026 availability. Club outings; 2026 contact listing.

For snorkelers, bring your own correctly fitting mask, fins, cold-water wetsuit and warm shore layers unless a rental shop confirms inventory. Verify what equipment is allowed on the public ferry, avoid wet gear obstructing passengers, and carry no prohibited collecting equipment into seabed conservation zones. Park advice; Park rules.

Sweden uses Swedish kronor. Debit and credit cards are common, and public-ferry tickets are sold through Vasttrafik channels; the campsite accepts card and Swish. Check any small seasonal businesses before relying on cash-only payment. Visit Sweden money advice; Ferry tickets.

Plan to withdraw cash or organize payment on the mainland in Stromstad rather than assuming an island ATM or every small jetty accepts cash. Bankomats exist in Swedish towns but exact island ATM availability was not independently checked. National currency advice.

Sweden uses nominal 230V/50Hz European power. Bring a suitable Type C/F adapter and verify charger voltage markings before use; some dive batteries are not multi-voltage. Swedish electrical authority.

Communications

Mobile signal is generally practical in settled coastal areas, but do not assume reliable coverage inside a remote cove or on a boat. Save ferry details and the current weather forecast offline and agree a surface recall method with your group. For emergencies call 112 or use marine VHF channel 16 from a suitably equipped vessel. Rescue channels.

Language

Swedish is the main local language; English is commonly used in tourist services and national-park interpretation. Naturum presents information for visitors, with multilingual interpretation in published visitor material. A dive or rescue briefing must be in a language the group actually understands. National park interpretation.

Insurance

Choose travel insurance specifically covering your certified scuba profile, cold-water or technical limits where relevant, interrupted ferries, maritime rescue, emergency transport and decompression treatment. Some standard travel policies exclude diving or deeper profiles. Visa applicants should separately check any required medical insurance under Schengen rules. Migration Agency entry requirements.

Packing list

Bring a windproof waterproof outer layer, grippy shoes, hat and warm dry spares in every season. For Rorvik or Hasslebukten: fitted mask/fins, wetsuit appropriate to assessed water temperature, towels and a buddy. For certified scuba: locally suitable suit, hood, gloves, SMB and dive computer, after confirming rental or fill options. For hikes: drinking water, offline island maps and an island-ferry return plan. Do not take collecting tools or drones into prohibited park uses. Snorkel advice; Park rules.

Kosterhavet and Stromstad

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