To the northwest coast of the prefecture of Ilia is the lagoon Kotychi and the southwest coast is the lagoon of Caiaphas, wetlands and ecosystems of great environmental value with beautiful beaches and ammothines.
Kotychi is a shallow brackish lagoon, which lies between the capes and Kounoupeli of Kyllini. It is the largest lagoon that has left to the Peloponnese, crusting of the lagoon Agoulinitsa, covering an area ranging from 7,100 to 8,500 acres, depending on the season and rainfall.
The lagoon is also included in the network Natura 2000, and has been characterized as an important area for birds of Greece, located in the southern part of the western flyway emigration of many aquatic birds. During the migration here, one can observe rare birds that stop to rest and feed.