In the nineteenth century, the Shannon Estuary was considered to be part of the river and the Shannon Commissioners devoted much of their time to it. This section shows some of the piers, quays and harbours of the estuary.
There is a post here with some information about Carrigaholt (and much else).
The Colleen Bawn at Killimer
Trips, passages and incidents
The Lord Lieutenant’s trip down the Shannon Estuary in 1856