Further downstream, another river, the Tungnaá, flows into it (see also Háifoss), before it enters the lowlands.

[citation needed] There it passes the valley of Þjórsárdalur (Thjorsardalur) where the historical farm of Stöng is located.

[2] In the lowlands it flows along the eastern border of the Great Þjórsá Lava.

In the middle of the now rather wide river, there is a big island called Árnes [ˈaurˌnɛːs], where there used to be a Þing.

'Á' signifies river while 'þjór' means bull and is cognate to Danish - tyr, Swedish - tjur and Latin - taurus.