MNRF Zones 4A · Ontario, Canada
St. Lawrence River & Ottawa River
5 Species · 5 Water Bodies
⚠ Not for navigation. Confirm official charts and local conditions. Fishing regulations change — always check the current Ontario Fishing Regulations Summary.
About This Zone
The St. Lawrence River and Ottawa River form two of Ontario's most iconic waterways, each offering distinct fishing experiences. The St. Lawrence — from Cornwall through the Thousand Islands to Kingston — is renowned for large smallmouth bass, walleye, and salmon runs. The Ottawa River, Ontario's longest river (1,271 km), offers wilderness pike and walleye fishing from Pembroke to the Quebec boundary.
Key Highlights
- ▸Thousand Islands — world-famous smallmouth bass destination
- ▸Ottawa River: 1,271 km of wilderness paddling and fishing
- ▸Salmon runs in the St. Lawrence spring and fall
- ▸Large walleye populations in both rivers
- ▸Mix of urban access (Cornwall, Ottawa) and remote wilderness
Water Bodies
Licence & Regulations
Ontario Fishing Licence required. Trout-Salmon stamp mandatory for Zone 4A. Salmon fishing requires additional permit during run seasons.