Its source is formed from several springs in Daudzese Parish, Aizkraukle Municipality.

[1] The Iecava flows through Taurkalne and Upmale plains of Middle Latvia lowlands (Viduslatvijas zemiene) where its banks are mainly wooded.

[1] To combat the spring flooding, the river has been largely straightened and the bed deepened.

A canal was dug 19 km above the old mouth to Lielupe, which drains part of the waters of the Iecava.

The rest flows into the Lielupe through the former bed, which is now called Veciecava ("Old Iecava") at this stage.