The Blue Caves are a popular tourist attraction located on the northeastern coast of the Greek island of Zakynthos (also known as Zante). These caves are known for their stunning blue waters, which create a mesmerizing visual experience for visitors. 

The caves get their name from the vibrant blue color that reflects off the water and the surrounding limestone cliffs. 

To reach the Blue Caves, you can take a boat tour from various starting points along the coast, such as Agios Nikolaos or Skinari Cape. These tours allow you to explore the caves up close and even swim in the crystal-clear waters, weather permitting. 

Inside the caves, sunlight passes through the underwater open-root structures, creating a magical effect as the rays illuminate the water and create vibrant blue hues. The caves vary in size, with some offering enough space for boats to enter, while others are smaller and accessible only by swimming.