Cassandreia was an ancient city located in the region of Macedonia, near the modern town of Cassandra in Greece. Founded in 315 BC by the Macedonian king Cassander, it was strategically positioned on the peninsula of Chalkidiki. The city served as a significant trade and cultural center in the Hellenistic period. The site of Cassandreia is known for its archaeological remains, which include ruins of public buildings, houses, and fortifications. It was also the location of the ancient theater, which could accommodate a large audience. Today, Cassandreia is an important archaeological site, attracting visitors interested in ancient history and Greek culture.