Boundary Waters Canoe Area Lakes and Streams
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| Name | County | Feature Type | Area |
|---|---|---|---|
| Oberg Lake | Cook | lake | Honeymoon Mountain |
| Octopus Lake | Cook | lake | Cherokee Lake |
| Odeima Lake | Lake | lake | Sawbill Landing |
| Ogishkemuncie Lake | Lake | lake | Ogishkemuncie Lake |
| Ogle Lake | Cook | lake | Gillis Lake |
| Ojibway Lake | Lake | lake | Ojibway Lake |
| Oketo Lake | Cook | lake | Kelso Mountain |
| Old Dutch Bay | St. Louis | bay | Ash River NE |
| Ole Lake | St. Louis | lake | Crab Lake |
| O'Leary Lake | St. Louis | lake | Hale Bay |
| Olio Lake | Cook | lake | Cherokee Lake |
| Olive Lake | St. Louis | lake | Buyck |
| Olso Lake | Cook | lake | Devil Track Lake |
| Olson Bay | St. Louis | bay | Shagawa Lake |
| Olson Bay | St. Louis | bay | Cranberry Bay |
| Omaday Lake | Lake | lake | Bogberry Lake |
| Omega Lake | Cook | lake | Gunflint Lake |
| Onagon Lake | Cook | lake | Munker Island |
| One Island Lake | Cook | lake | South Lake |
| One Pine Lake | St. Louis | lake | Bear Island |
| One Toe Lake | Cook | lake | Kelso Mountain |
| Onion Lake | Cook | lake | Crocodile Lake |
| Onion River | Cook | stream | Tofte |
| Orchid Lake | Lake | lake | Perent Lake |
| Organ Lake | Lake | lake | Wilson Lake |
| Organ Lake | Lake | lake | Kawishiwi Lake |
| Oriniack Lake | St. Louis | lake | Astrid Lake |
| Oriole Lake | Cook | lake | Kelso Mountain |
| Osier Creek | Lake | stream | Isabella Station |
| Osier Lake | Lake | lake | Isabella Station |
| Oslo Lake | St. Louis | lake | Kempton Bay |
| Osprey Lake | Cook | lake | Lima Mountain |
| Ott Lake | Cook | lake | Eagle Mountain |
| Otter Lake | Cook | lake | Tom Lake |
| Otter Lake | Lake | lake | Isabella |
| Otter Lake | St. Louis | lake | Chad Lake |
| Ottertrack Lake | Lake | lake | Ester Lake |
| Otto Lakes | Cook | lake | South Lake |
| Outlaw Lake | Lake | lake | Wilson Lake |
| Outlet Bay | St. Louis | bay | Crab Lake |
| Ova Lake | Lake | lake | Mitawan Lake |
| Owens Creek | St. Louis | stream | Soudan |
| Owl Lake | Cook | lake | Gillis Lake |
| Oyster Lake | St. Louis | lake | Lake Agnes |
| Oyster River | St. Louis | stream | Lake Agnes |
| Ozada Lake | Cook | lake | Eagle Mountain |
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