Korttajärvi is a lake located in Puuppola, a village in the municipality of Jyväskylä in Central Finland.

[1] The 0.44 km² lake is 1.8 kilometers long and around 650 meters wide.

It has a long narrow shape and only the middle part of the lake is as wide as stated.

The slopes of Laahanmäki rise from the southern Coast of the lake.

The length of the lake's shoreline is 4.5 kilometers and its shores are partly arable and forest land.