Ganh Da Dia, also known as the "Cliff of Plates," is a unique geological formation located in the central coast of Vietnam, near the city of Tuy Hoa. The formation consists of a series of interlocking hexagonal basalt columns that resemble a giant mosaic of plates. The columns range in size from a few centimeters to several meters in diameter and form a natural amphitheater of cliffs that stretch along the coast.

The formation is believed to have been created millions of years ago through volcanic activity, when lava flowed into the sea and cooled rapidly, forming the distinctive hexagonal shapes. Over time, erosion and weathering have sculpted the columns into their current formation, creating a breathtaking landscape of black and gray rocks jutting out from the sea.

Visitors to Ganh Da Dia can explore the area on foot, following a well-marked path that winds through the columns. The cliffs provide a stunning backdrop for photography, and visitors can also enjoy panoramic views of the sea from the top of the cliffs.

The area surrounding Ganh Da Dia is also home to a variety of marine life, including crabs, snails, and other sea creatures. Visitors can explore the rock pools and tidal areas for a closer look at these fascinating creatures.