Tromsø is the eighth-largest municipality in Norway with a population 69,116, and the centre of the ninth-largest urban area, with a population of 58,486.The city is home to the world's most northerly university and also houses the most northerly botanical garden and planetarium.
The city center is located on the east side of the Tromsøya — over 300 kilometres (190 mi) inside the Arctic Circle at 69°40′33″N 18°55′10″E. Suburban areas include Kroken, Tromsdalen (on the mainland, east of the Tromsøya island), the rest of the Tromsøya island, and the eastern part of the large Kvaløya, west of the Tromsøya island. The Tromsø Bridge and Tromsøysund Tunnel both cross the Tromsøysundet strait connecting the mainland with Tromsøya by road. On the western side of the city, the Sandnessund Bridge connects Tromsøya island with Kvaløya island.
There are many tall mountains within the municipality including Hamperokken, Jiehkkevárri, Store Blåmann, Store Fornestinden, and Tromsdalstinden. The Lyngen Alps mountain range lies along the Tromsø-Lyngen municipal border. There are many islands that make up the municipality of Tromsø including Hillesøya, Kvaløya, Rebbenesøya, Ringvassøya, Sommarøya, and Tromsøya. There are also several fjords that are located in Tromsø including the Balsfjorden, Kaldfjorden, Malangen, and Ullsfjorden.
Light and darkness
The Midnight Sun occurs from about 18 May to 26 July, although the mountains in the north block the view of the midnight sun for a few days, meaning that one can see the sun from about 21 May to 21 July. Owing to Tromsø's high latitude, twilight is long, meaning there is no real darkness between late April and mid-August.
The sun remains below the horizon during the Polar Night from about 26 November to 15 January, but owing to the mountains the sun is not visible from 21 November to 21 January. The return of the sun is an occasion for celebration. However, because of the twilight, there is some daylight for a couple of hours even around midwinter, often with beautiful bluish light. The nights shorten quickly, and by 21 February the sun is above the horizon from 7:45 am to 4:10 pm, and 1 April from 5:50 am to 7:50 pm (daylight saving time).
The combination of snow cover and sunshine often creates intense light conditions from late February until the snow melts in the lowland (usually late April), and sunglasses are essential when skiing. Because of these diametrically different light conditions in winter, Norwegians often divide it into two seasons: Mørketid (Polar Night) and Seinvinter (late winter).
Tromsø is in the middle of the Aurora Borealis (Northern Lights) zone, and is in fact one of the best places in the world to observe this phenomenon. Because of the planet's rotation, Tromsø moves into the aurora zone around 6 pm, and moves out again around midnight. As it is light round the clock in the summer, no aurora is visible between late April and mid-August
22nd of June 2013 it's time for the 24th Midnight Sun Marathon in Tromsø (Norway). Last year runners from more than 63 nations participated. About 1500 runners from abroad participates in the event; UK, USA, Germany, Sweden, Italy, Brazil, Australia and many other nations are represented.
23-25th of August 2013 Tromsø Mountain Challenge is held, with two challenging uphillruns and one ultra marathon held druring the same weekend.
January 4th 2014 Polar Night Halfmarathon is held.