3-Sjøersløpet is a November half marathon held in Stavanger, Norway. The start and finish are located at Tjensvoll, approximately 3 km from the city center. GTI Friidrettsklubb organizes the event, utilizing Forum Expo as the primary indoor facility before and after the race. Registration typically opens seven months in advance. For a local road-and-trail event, the field is substantial, with expectations of up to around 5,200 participants. The race begins late in the morning, with the start divided into 12 waves, spaced a few minutes apart to distribute the runners.
The name reflects the course: Stavanger features three lakes near the city center, and the race incorporates their well-used gravel paths into a half marathon route. Roughly 80% of the course consists of runnable gravel, with the remainder on asphalt, giving it the character of a swift park-and-lake run rather than a typical city-road race. Pacers are provided for those aiming for a consistent pace, and the course map indicates the route, aid stations, restrooms, and areas suitable for spectators. Throughout the race, participants encounter crowds, flags, and music, contributing to a lively community atmosphere instead of a subdued training-run environment.