Ghenh Da Dia is a unique landscape in An Ninh Dong commune, Tuy An district, Phu Yen province with strangely structured rocks including large upright stones lie regularly in pentagon. The surfaces of the stones look like thousands of master black plates heaping over one another by deep blue sea.
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It is said that this rapids was formed by an erupting volcano thousands of years ago. The huge lava flows from volcanic grater was frozen when they encounter cold water from the sea and then cracked into layers of stone columns of 60 cm to 80 cm high above sea level.
Ghenh Da Dia is 50 m wide and over 200 m long located close to the coast. The stones stand in columns and link together. The surface of each stone is often in hexagonal or round shape. This place is also the home to many sea creatures, especially the presence of rong mut, a type of tough and salty seaweed that often sticks over the rocks.
The stones in Ghenh Da Dia are bazan stones of dark black and light yellow in different sizes. Some of them weigh tons but the others are beatiful small stones with a variety of unique shapes such as round, pentagon, polygon. Moreover, standing on Ghenh Da Dia, tourists will see the fishing vessels and fishermen leaning forward to clutch the raw fish catches in bustling atmosphere of a new day.
Connecting to Ghenh Da Dia is a small mountain which was constituted by polygonal stone columns. To reach the mountain, tourists have to pass over a small rapids.