The TianTai Mountain, with its altitude of 53 meters and grassland areas, is the highest point on WangAn Island. Nearby is Penghu's well-known site for producing beautiful stones. The surrounding grasslands are flat, occasionally adorned with grazing cows and sheep, creating a naturally picturesque landscape. TianTai Mountain has become the best vantage point for viewing both WangAn's main island and Hsiao Yu Island on the opposite shore. The rock formations of TianTai Mountain are primarily composed of micro-porphyritic gabbro blocks, exhibiting sheet-like joints. On the western sea cliff, magnificent basalt landscapes can be found. Following the path along the western coast, one can discover a striking 30-meter-high sea cave. The structural beauty of the micro-porphyritic gabbro joints differs from the columnar basalt formations of HuJing and TongPan islands. The intersecting sheet-like joints in TianTai Mountain create beautiful "stone flowers."