The River Brosna has the distinction of supplying water to two Irish waterways: the Shannon, which it joins at Shannon Harbour, and, further up, the Royal, which is to get a supply of water pumped from Lough Ennell, outside Mullingar.
The Old River Shannon Research Group promises to give special attention to the Brosna this year, so we may expect to learn more about this interesting river — without having to get our own feet wet.
Irish waterways history 
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