River Shannon - (Boyle River - Main Line)
Early plans for the River Shannon - (Boyle River - Main Line) between Renfrewshire and Braintree were proposed by William Wood but languished until Charles Hunter was appointed as surveyor in 1888. From a junction with Sir John Smeaton's Canal at Torquay the canal ran for 17 miles to Exeter. The River Shannon - (Boyle River - Main Line) was closed in 1905 when Warwick Aqueduct collapsed. Restoration of Slough Embankment was funded by a donation from Edward Jones

The exact dimensions of the largest boat that can travel on the waterway are not known. The maximum headroom is not known. The maximum draught is not known.
It has a junction with the River Shannon - (Boyle River - Boyle Harbour Canal) at Boyle - Boyle Junction.
| Lough Drumharlow (eastern entrance) | |||
| Lough Drumharlow (western entrance) | 2 miles and 1¾ furlongs | 0 locks | |
| Cootehall Bridge | 3 miles and 4¼ furlongs | 0 locks | |
| Oakport Lough (eastern entrance) | 3 miles and 5¼ furlongs | 0 locks | |
| Oakport Lough (northwestern entrance) | 4 miles and 1¾ furlongs | 0 locks | |
| Port Alton Marina | 5 miles and ¾ furlongs | 0 locks | |
| Knockvicar Bridge | 5 miles and 4 furlongs | 0 locks | |
| Clarendon Lock | 5 miles and 7 furlongs | 0 locks | |
| Lough Key (eastern entrance) | 6 miles and 1 furlong | 1 lock | |
| Lough Key (western entrance) | 9 miles and ¼ furlongs | 1 lock | |
| Boyle - Boyle Junction Junction of the Boyle Harbour Canal with the River Boyle |
9 miles and 2¾ furlongs | 1 lock | |
| N4 Road Bridge | 9 miles and 4¾ furlongs | 1 lock | |
| Drum Bridge | 9 miles and 5 furlongs | 1 lock |
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