Tromsøysundet is a strait

Strait

A strait or straits is a narrow, typically navigable channel of water that connects two larger, navigable bodies of water. It most commonly refers to a channel of water that lies between two land masses, but it may also refer to a navigable channel through a body of water that is otherwise not...

 located in the municipality of Tromsø

Tromsø

Tromsø is a city and municipality in Troms county, Norway. The administrative centre of the municipality is the city of Tromsø.Tromsø city is the ninth largest urban area in Norway by population, and the seventh largest city in Norway by population...

 in Troms

Troms

or Romsa is a county in North Norway, bordering Finnmark to the northeast and Nordland in the southwest. To the south is Norrbotten Län in Sweden and further southeast is a shorter border with Lapland Province in Finland. To the west is the Norwegian Sea...

 county, Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. It separates the island of Tromsøya

Tromsøya

Tromsøya is a small island in the strait between the mainland and Kvaløya island in Tromsø municipality, Troms county, Norway. It contains the city centre and several residential areas of the city of Tromsø and has given the city its name. The island's area is roughly and has a population of...

 (where the city centre is) from the mainland east of the island. The strait is crossed by the Tromsøysund Tunnel

Tromsøysund Tunnel

The Tromsøysund Tunnel is an undersea highway tunnel under the Tromsøysund sound, connecting the island of Tromsøya with the mainland in Tromsø, Norway....

 (E8 highway

European route E8

The European route E 8 is a European route that goes from Tromsø, Norway to Turku, Finland. The length of the route is .* E 8: Tromsø – Nordkjosbotn – Skibotn – Kilpisjärvi – Kaaresuvanto – Muonio – Tornio – Keminmaa – Kemi – Oulu – Liminka – Raahe – Kalajoki – Kokkola – Vaasa – Pori –...

) and the Tromsø Bridge

Tromsø Bridge

The Tromsø Bridge is a cantilever road bridge in the city of Tromsø, Norway. It crosses the strait of Tromsøysundet between Tromsdalen on the mainland and Tromsøya. Construction began in 1958, and the bridge was opened in 1960. At the time of its opening, it was the longest bridge in Northern...

. The strait is about 11 kilometres (6.8 mi) long and it is about 0.6 to 3 km (0.372823641989884 to 1.9 ) wide.