The river Laukysta flows in Kaunas county, Kaisiadorys district, the river Neris left tributary. Length of the river 27 km, the basin area 121 km ². The source 5 km south from Zasliai village. Flows to the north through the lakes Zasliai, Liminas and Statkuniske. Flows into the river Neris 66 km from its mouth at Kaspariskiai village. Average gradient 298 cm / km. Average rated discharge at the mouth 0.82 m³/s.

At high water level. Spring flood, or after heavy rains.
Rapids, shalows, strainers.
WW 1 (1+).

7.2 Zubiskes - Krivoniai road bridge. Small rapids. At the banks trees and bushes. Strainers.
5.2 Bridge. To the mouth shalows, small rapids, in some places big boulders. Average gradient to the mouth 475 cm/km.
4.9 left Silonys. Downsteam the rifer flows through Geguzine forest. Strainers in the riverbed.
1.7 Zasliai - Jonava road bridge. Under bridge the river flows through concrete pipe. Forest ends.
0.5 righ Kaspariskes. The current calms.
0.0 The Laukysta flows into the river Neris.