It begins southwest of Code as the former headwaters of the Garoze River.
The mouth of the river in Iecava Parish is located near Zālīte.
In a large part of the Īkstrum's course, the bed is regulated.
The most notable settlements on its banks are Code, Bērzmuiža, Zālīte.
The Īkstrums has been mentioned in Edvards Virza's works.