Glomma

Glomma, also known as Glåma, is the longest river in Norway, with an approximate length of about 620 kilometers. It flows through the southeastern part of the country, draining parts of Innlandet and Viken counties. Its headwaters lie in the eastern highlands around Rendalen, and it runs southeast to the Oslofjord at Fredrikstad.

Along its course the river traverses forested valleys and agricultural land, forming a major geographic feature of the Glomma valley. Notable towns along the river include Elverum and Kongsvinger, among others, which have historically developed in relation to the river and its resources.

The Glomma basin hosts numerous hydroelectric facilities; hydropower development along the river has been a significant part of regional energy supply. In addition to energy production, the river supports various water-management and recreational activities and influences local land use.

Historically, Glomma was important for timber transport. From the 17th through the 19th centuries, logs were floated downstream from forests to sawmills and coastal markets, contributing to the regional economy and settlement patterns. The timber industry has since declined, but historical rafting remains a notable part of the river’s heritage.

The basin is largely forested and used for forestry and agriculture, with environmental regulation aimed at balancing energy production, flood management, and habitat protection. The river is a key geographic and cultural feature of eastern Norway, reflecting both its natural resources and industrial history.

The name Glomma (Glåma) is used interchangeably; Glomma is the standard Norwegian form, while Glåma appears in some dialects and contexts.