[1] After it passes through the town of Širvintos, where a low head dam has been built, it continues through the Ukmergė district, and borders the Jonava district.

The Širvinta has a rapid flow and winding rocky bed, which is used by kayakers.

[2] The Širvinta Landscape Reserve, encompassing the river banks and escarpments of the Širvinta, was established in 1992 to protect the channel's unique landscape.

Some of the loamy scarps near Upninkai reach as high as 40 metres.

The name of the river is probably derived from the Baltic adjective širmas or širvas, meaning brown.