Kaki Thalassa

Kaki Thalassa (Κακή Θάλασσα) is a Mediterranean port town located in the municipality of Lavreotiki, East Attica, Greece, 30 km southeast of the nation's capital, Athens. Kaki Thalassa is 23 m above sea level. A rural town, it had a total population of 165 according to the 2021 Greek census.

Prior to the 2011 Kallikratis local government reform program, Kaki Thalassa was part of the municipality of Keratea.

The town's name, literally translated, means evil sea, from κακή (the nominative singular form of κακός), meaning bad or evil, and the (feminine gendered) noun θάλασσα, meaning sea.