The basalt columns at Tongpan were formed during the Miocene epoch through rapid cooling of lava flows.
Tongpan is the only island in the Penghu chain that features such continuous and tall hexagonal columnar joints on its perimeter.
The island's name, 'Tongpan,' translates to 'bronze plate' or 'serving tray,' referencing its flat-topped appearance from a distance.
The hexagonal structure is a result of contraction during the volcanic cooling process, which creates geometric tension fractures.
The park's geology is structurally similar to the Giant’s Causeway in Northern Ireland.
Tongpan Geology Park is renowned for its expansive, well-preserved hexagonal basalt columns formed by volcanic activity millions of years ago. These vertical columns are arranged along the island's coastline, resembling a giant organ or wall, and are considered one of the most spectacular geological features in the Penghu archipelago. The park covers the southern half of Tongpan Island and features a circular boardwalk that allows visitors to view the geological formations up close. Marine erosion has further sculpted the base of these basalt pillars, creating distinct layers and sea-carved crevices. The site is a protected geological monument managed by the Penghu National Scenic Area Administration.
The elevated viewing pavilion which offers a panoramic perspective of the basalt wall against the blue ocean.
Bring a hat and high-SPF sunscreen as the basalt reflects sunlight and there is almost no natural shade on the coastal path.
Wear sturdy, non-slip walking shoes to navigate the uneven coastal terrain and stone pathways.
Carry plenty of water, as there are very few vendors located on the island itself.
Do not attempt to walk along the base of the cliffs during high tide or rough sea conditions due to the risk of falling debris.
Accessible only via private boat charters or local island-hopping ferries from Magong, which may be suspended during extreme weather or strong seasonal monsoons.
Do not climb on the basalt columns or remove volcanic rocks, as the site is protected by conservation laws.
