The Gulf of Thermaikos is a large body of water located in northern Greece, part of the Aegean Sea. It lies to the west of the city of Thessaloniki, which is the second-largest city in Greece. The gulf is known for its rich marine life and beautiful coastal landscapes, making it a popular destination for both locals and tourists. The gulf is bordered by several towns and villages, including Katerini and Nea Moudania. It plays an important role in the local economy, supporting fishing and tourism. Additionally, the gulf is significant for its historical connections, as it has been a vital trade route since ancient times.