The largest tributary to Glomma River in Akershus County is the Vorma. It flows from Lake Mjøsa down to the Glomma River through a gloriously varied riverine landscape in the Eidsvoll and Nes Municipalities. The Svanfoss with dam and locks is a landmark, a cultural setting and an important partition in the river. During the summer boats are passed through the locks. The tourist boat Elvekungen serves the river on a summertime schedule.
It is mostly shallow along the Vorma River shores, though in the middle there is a deep channel. The bottom of the river is mostly clay with some sand and rock. The surrounding forest is mostly deciduous and there is some cultivated land used for growing barley. There are water plants on the banks and bottom of the river. Secchi results for the river vary with water flow and season.