| Da'an River | |
| Pushpin Map: | Taiwan |
| Pushpin Map Alt: | Map showing the mouth of Da'an River |
| Pushpin Map Caption: | Da'an River in Taiwan |
| Source1 Location: | Xueshan Range |
| Source1 Coordinates: | 24.4213°N 121.1409°W |
| Source1 Elevation: | 3488m (11,444feet) |
| Mouth Location: | Taiwan Strait |
| Mouth Coordinates: | 24.4072°N 120.5931°W |
| Basin Size: | 758.47km2 |
| Subdivision Type1: | Country |
| Subdivision Name1: | Taiwan |
| Length: | 105km (65miles) |
| Discharge1 Max: | 13840m3/s |
The Da'an River is a river in northwestern Taiwan. It is the seventh-longest river on the island, it flows through Miaoli County and Taichung City for 105km (65miles). It reaches the Taiwan Strait between the Dajia District and Da'an District, Taichung.[1] [2]
The Da'an River was affected by the 1999 Jiji earthquake, where a gorge was formed (called Da'an River Grand Canyon). In some of the fastest erosion geologists have ever seen, the gorge is being eaten away from its upstream end at a rate of 17 meters per year. They expect the gorge to be erased after 50 years.[3] [4]