Ganh Da Dia is a unique geological formation located in Phu Yen, Vietnam. It features thousands of interlocking basalt columns that were formed by volcanic activity. The columns, resembling giant stone pillars, create a stunning natural landscape along the coastline, attracting both tourists and researchers. Visitors to Ganh Da Dia can enjoy breathtaking views of the ocean and the surrounding area. The site is also known for its rich biodiversity, with various marine species inhabiting the waters nearby. It is a popular destination for photography, nature walks, and exploring the natural beauty of Vietnam.