Tistilbekken

Tistilbekken, also called Fjelstadbekken, is a river in Ask in the municipality of Gjerdrum in Akershus county, Norway. It flows through the residential area Nystulia and from Brådalsfjellet.

2020 Gjerdrum landslide
Tistilbekken flows into a soil area consisting of a lot of clay. On the night of 30 December 2020, the area was hit by the 2020 Gjerdrum landslide which is described as the most serious in Norway of this type in recent times. Large amounts of precipitation are considered to have had a triggering factor. Tistilbekken's role in the stability of clay and quick clay in the area has been discussed for several years.