The cave of Melissani is located near Karavomilos on the island of Kefalonia. It is a lacustrine cave of unique beauty and fully developed cave, which is 3.5 km long, 40m wide and 36m high. Melissani cave constitutes a unique geological phenomenon. It was created by a mechanical and chemical process called karstikopoiisi (dissolution of rocks) during which water enters the calcareous rocks, erodes them and creates hollows.

The magnificent Blue Caves are in the north of the Greek Ionian island of Zakynthos. the blue caves are only accessible by the sea. The biggest cave is called Kianoun, and there are, in general terms, many boats available for rent in the town port for tourists to be able to get to the blue caves.

The Corinth Canal is a man-made waterway located in Greece, which connects the Gulf of Corinth in the Ionian Sea with the Aegean Sea. It cuts through the narrow isthmus of Corinth and separates the Peloponnese peninsula from the mainland of Greece.

Greece is a country in Southeast Europe. It is situated on the southern tip of the Balkans, and is located at the crossroads of Europe, Asia, and Africa. The country consists of nine traditional geographic regions, and has a population of approximately 10.7 million. Athens is the nation's capital and largest city, followed by Thessaloniki.

Meteora is a unique and breathtaking rock formation located in central Greece. It is famous for its monasteries perched atop towering rock pillars, creating a stunning and otherworldly landscape. Meteora is located in the Thessaly region of central Greece, near the town of Kalambaka. It's situated in a valley surrounded by towering rock formations.

Kastania Cave, also known as the Kastania Cave of Agios Andreas, is one of Greece's most impressive and lesser-known natural wonders. It is located near the village of Kastania in the southeastern Peloponnese, within the region of Laconia. This cave is celebrated for its rich geological formations and captivating underground scenery.