Annong River Diversion Weir | Yilan Attraction

The Annong River Diversion Weir spans the Annong River in Sanxing Township. A trail runs along the top of the weir structure, offering a view down over the still water created by the dam and the farmland landscape downstream. Sanxing Township is the main production area for Sanxing scallions and garlic. The farmland surrounding the weir shows deep-green blocks of scallion fields at different seasons, forming one of the contextual backdrops of this attraction.

Highlights of Annong River Diversion Weir

The Annong River is a tributary of the Lanyang River system, flowing through Sanxing Township before joining the Lanyang River. The diversion weir's primary function is water-flow regulation to reduce downstream flooding. A waterside trail has been built along the top of the weir — it is not long, the slope is gentle, and it is walkable by visitors of all ages. The weir-top view is broad: the contrast between the impounded water surface upstream and the gravel riverbed downstream, combined with the surrounding farmland extending to the distant mountains, is the main visual content here.

Sanxing Township's agricultural practices retain a relatively traditional, labor-intensive approach; the scallion growing cycle means the farmland scenery changes with the seasons. A cycling path runs along the Annong River, with some sections fully paved — the main leisure cycling route within Sanxing Township. There are no dining facilities near the weir; it is recommended to eat in Sanxing town center before heading out.

How to make the most of your visit

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Extend the trip along the Annong River cycling pathThere are sections of cycling path along the Annong River; cycling from Sanxing town center to the diversion weir takes about 20 to 30 minutes and lets you observe the scallion-field agricultural landscape along the way.

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Combine with purchasing Sanxing scallions at the sourceThere are direct-sale agricultural stalls for Sanxing scallions in the Sanxing town center and Tiansonpi area; when visiting the diversion weir, you can stop to learn about local produce — agricultural direct sales are usually fresher than supermarkets elsewhere.

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Morning light is best for the scallion-field landscapeMorning light at a low angle brings out the deepest color gradations in the scallion fields, and paired with thin mountain mist, it is the better time slot for photographing the agricultural landscape here.

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The weir-top trail suits a brief stopThe weir-top trail is not large in scale; it is best planned as a midway stop on a broader itinerary rather than as the sole destination of a standalone trip.

Practical information

Getting there and travel time

Drive from Sanxing town center in the direction of the Annong River; there is no direct public transport, so driving or cycling is recommended.
Tiansonpi is about 10 to 15 minutes by car from Sanxing town center; road conditions are good, though surrounding roads are mostly farm tracks — watch out for agricultural vehicles.

Nearby connections

Within Sanxing Township, Xingjian Organic Village and other agricultural experience sites can be combined to learn about Yilan's organic farming practices.
Heading north connects to Datong Township, with Taipingshan or Mingchi as extensions for a mountain itinerary.

Sources: Yilan County Sanxing Township Office; Wikipedia entry on 'Annong River.' Photos to be replaced with Dio's own shots.

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