There are some tributaries within the Shannon River Basin which have headwaters that are further in length (from source to mouth) than the Shannon Pot source's length of , such as the Owenmore River, total length in County Cavan and the Boyle River, total length with its source in County Mayo.
there are some tributaries within the shannon river basin which have headwaters that are further in length (from source to mouth) than the shannon pot source's length of  such as the owenmore river total length in county cavan and the boyle river total length with its source in county mayo