Oulun Tervahiihto or Tervahiihto is an annual ski marathon held in Oulu

Oulu

Oulu is a city and municipality of inhabitants in the region of Northern Ostrobothnia, in Finland. It is the most populous city in Northern Finland and the sixth most populous city in the country. It is one of the northernmost larger cities in the world....

, Finland

Finland

Finland , officially the Republic of Finland, is a Nordic country situated in the Fennoscandian region of Northern Europe. It is bordered by Sweden in the west, Norway in the north and Russia in the east, while Estonia lies to its south across the Gulf of Finland.Around 5.4 million people reside...

. Held since 1889, it is the longest-running annual long-distance ski race in the world. Races include 40km and 70km in both traditional and skating styles, and the terrain is mostly flat.

In 2005 the race formally became affiliated to the FIS

FIS

FIS may refer to:In English:* Faculty of Information Studies, now the University of Toronto Faculty of Information* Fairy Investigation Society* Far-Infrared Surveyor, an instrument on the AKARI space telescope* Federal Inspection Station of the U.S...

 with the founding of the FIS Nordic Ski Marathon Cup

FIS Nordic Ski Marathon Cup

The FIS Nordic Ski Marathon Cup is an official skiing marathon cup held since 2005 and governed by the FIS. The cup consists of four locations, held several weeks apart in each of the Nordic countries...

, a series which includes the Holmenkollen Skimaraton

Holmenkollen Skimaraton

Holmenkollen Skimaraton is an annual ski marathon held in Norway. Held since 1974, in 2005 the race formally became one of the locations of the FIS Nordic Ski Marathon Cup, a series which includes the Holmenkollen Skimaraton, Tornedalsloppet in Sweden, the Fossavatn Ski Marathon in Iceland and...

 in Norway, Tornedalsloppet

Tornedalsloppet

Tornedalsloppet is an annual ski marathon held in Övertorneå, Sweden. Held since 1968, Tornedalsloppet is among the older long-distance ski-races in Sweden and the only one which commences in the Arctic Circle and finishes south of it. Traditionally two different races are held, one 45 km for...

 in Sweden, the Fossavatn Ski Marathon

Fossavatn Ski Marathon

Fossavatn Ski Marathon is an annual ski marathon held in Ísafjörður, northwestern Iceland.It is the oldest ski race in Iceland, held since 1935...

in Iceland and the Oulun Tervahiihto. The race is now usually the second race of the cup, held in March.