Mattilanlahti is a 17 ha large bay of Kalavesi, one of the largest lakes of Finland.

Its banks are covered with relatively high vegetation, such as Phragmitis australis.

The area is used for agriculture with several farms.

Liesjoki ends up in Mattilanlahti.

Dragonfly observations Mattilanlahti
 Species AdultExuviae
1A. grandis++
2S. metallica++
3E. bimaculata-+
4S. danae++
5S. flaveolum+-