Jiangjun Ao is an uninhabited island located approximately 2 km southwest of Wang-an Island. It is known for the distinctive columnar basalt formations on its southern cliffs. These basalt columns, shaped by millions of years of wave erosion, form a striking array of five- and six-sided stone pillars that resemble ancient fortifications—the name “Jiangjun Ao” (General’s Cove) likely references this resemblance. The formations represent one of Penghu’s most significant volcanic geology landmarks.
The island’s west shore features a pristine white-sand beach, while the east side rises as steep cliffs. The island remains uninhabited and retains its natural character. Geology enthusiasts and photographers are frequent visitors, particularly during sunrise or golden-hour light when the columnar formations create dramatic contrast and shadow effects.
Highlights
The columnar basalt formations on the island’s southern side are the primary visual attraction—dark gray pillars rise sharply from the sea in regular formations. These columns typically measure 0.5–1.5 m wide and display five- or six-sided cross-sections, representing a classic example of how basalt cools and naturally fractures. The formations share the same geological origin as the columnar basalt coasts of Jeju Island in Korea and other columnar sites around Penghu, such as Tongpan.
The western beach is the main landing point, where fine white sand contrasts sharply with dark rock formations. At low tide, the rocky intertidal zone often reveals starfish, sea urchins, and other intertidal organisms—a good spot for snorkeling and tide-pool exploration.
Access and Nearby Areas
No bus service to this location. Jiangjun Ao sits on an outer island with no marine bus route. Access requires a ferry ticket purchased from Magong Harbor, typically as part of an organized day tour. Tour operators frequently bundle Jiangjun Ao with Wang-an Island’s natural attractions (Yinhe Beach, Tiangtai Mountain trail) and Qimei Island (Twin-Heart Fish Weir, Yueli Bay) into a full-day package. Single-leg boat travel is 30–40 minutes; with landing time included, the round trip typically takes about 2 hours.
Alternatively, take a public ferry to Wang-an Island (approximately 40 minutes from Magong; see /ferry/), then arrange a local boat charter from there for more flexibility. Always confirm ferry schedules and weather conditions when booking, as winter northeast winds frequently cause service suspensions.