Nimney Bourne
| Nimney Bourne | ||
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| Data | ||
| location | Hertfordshire , England | |
| River system | Thames | |
| Drain over | River Ash → River Lea → Thames → North Sea | |
| source | west of Much Hadham 51 ° 49 ′ 16 ″ N , 0 ° 2 ′ 24 ″ W |
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| muzzle | in the River Ash coordinates: 51 ° 48 ′ 23 " N , 0 ° 1 ′ 43" W 51 ° 48 ′ 23 " N , 0 ° 1 ′ 43" W.
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The Nimney Bourne is a watercourse in Hertfordshire , England . It arises west of Much Hadham and flows south to its confluence with the River Ash at Wareside .