Caipu'ao Geopark is one of ten designated geological sites within Matsu Geopark, established in 2018, located in a bay on the northeastern side of West Juguang Island. Its reef rock shows distinct flow-banded textures markedly different from Matsu's dominant granite geology, making it an important site for geological education.
Matsu established Matsu Geopark under the Cultural Heritage Preservation Act in 2018 — Taiwan's first local-level geopark — dividing the county into ten designated geological zones, of which Caipu'ao on West Juguang is one. Its reef rock differs from the granite common on Nangan and Beigan; mineral crystals are less distinct and the rock shows flow-banded textures, variously classified in sources as tuff or rhyolite, both extrusive volcanic rocks — a geologically distinctive site in Matsu. On calm nights from April to June each year, Caipu'ao is also known as one of the sites where the bioluminescent "blue tears" phenomenon can be observed.
Highlights of Caipu'ao
Rhyolite is an acidic extrusive volcanic rock. When magma erupts onto the surface and cools rapidly, minerals that have not had time to crystallize form a glassy matrix; the flow also produces banded textures known as "flow lines" (rhyolite). The geological foundation of the Matsu area is primarily granite, but here at Caipu'ao a special geological structure has preserved a rhyolite stratum — unique in all of Taiwan and of significant educational value for geology.
The rock color shifts from grey-white to pink depending on silicate mineral content; the direction of the banding twists with geological structure. Combined with the sea-eroded grooves and sea stacks sculpted by wave action, the entire coastline resembles an abstract geological canvas. Each year from April to August, if sea conditions are stable, bioluminescent dinoflagellates may appear in the nearshore waters of the bay, creating the blue tears phenomenon — but whether they appear depends on that year's sea conditions and cannot be guaranteed.
How to Make the Most of Your Visit
Practical Information
Getting There and Time Needed
- To reach West Juguang, take a ferry from Fuao Harbor on Nangan. Schedules are affected by weather — confirm with Matsu Shipping Company.
- Caipu'ao is on the southern side of West Juguang Island, about a 10- to 15-minute scooter ride from Qingfan Harbor. The reef terrain requires non-slip shoes for walking; some sections are steep.
Nearby Connections
- Can be combined with Kunqiu Beach (Square Waves) for a West Juguang day trip: morning at Kunqiu, afternoon at Caipu'ao. If you stay overnight on West Juguang, you can add a blue tears watch session.
- During the April-to-August blue tears season, all of Matsu's islands offer viewing opportunities. Nangan and Beigan also have designated viewing spots — can be integrated into an island-wide itinerary.
Source: Matsu National Scenic Area Administration geological landscape descriptions, Lienchiang County Government tourism information. Photos pending Dio's on-site shots.
Frequently Asked Questions
When was Caipu'ao Geopark established?
Matsu Geopark was established in 2018 under the Cultural Heritage Preservation Act, Taiwan's first local-level geopark, and Caipu'ao is one of its ten designated zones.
Is Caipu'ao's rock the same as elsewhere in Matsu?
No — Caipu'ao's reef rock shows flow-banded textures and is variously classified as tuff or rhyolite, unlike the granite common on Nangan and Beigan.
Can you see blue tears at Caipu'ao?
Yes, from April to June each night when sea conditions are calm, Caipu'ao is a well-known blue tears viewing spot in Matsu, though sightings cannot be guaranteed.
Sources
- 馬祖群島的地質歷史－馬祖國家風景區地質公園深度旅遊網 — 確認2018年地質公園成立、十景觀區劃分
- 火成岩特徵－馬祖國家風景區地質公園深度旅遊網 — 確認菜埔澳礁岩非花崗岩、屬凝灰岩/流紋岩噴出岩分類