Formosa Island
| Formosa Island | ||
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 (looking downstream) |
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| Waters | Thames | |
| Geographical location | 51 ° 34 ′ N , 0 ° 42 ′ W | |
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Formosa Island is an island in the River Thames , in England at Cookham Lock near Cookham , Berkshire . Two small islands are in the immediate vicinity.
With a size of 20 hectares , the wooded island is one of the largest islands in the Thames above Teddington Lock . The island can be reached via a footbridge from Cookham. Formosa lies between two of the river's four arms at Cookham. The closest to Cookham used to be a mill stream for a local paper mill. The other arm of the river leads to the Odney Weir . The opposite Mill Island borders the river arm to the lock. Beyond the lock access is Sashes Island . The branch of the river furthest from Cookham is Hedsor Water , the original shipping canal closed for this purpose by the construction of the weir in 1837.