Bertha Lake
51.2675° N, 92.2908° W
Depth contours from the government survey. Not for navigation.
Download the depth map (SVG)Bertha Lake, Ontario. 51.2675° N, 92.2908° W
Maximum depth 9.1 m. Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/bertha-lake/, compiled October 9, 2026
- Canadian Geographical Names Database, Natural Resources Canada. Contains information licensed under the Open Government Licence – Canada.
- HydroLAKES v1.0, Messager et al. 2016 / WWF HydroSHEDS. Licensed under CC BY 4.0.
- Census boundaries and population, 2021, Statistics Canada. Adapted from Statistics Canada. This does not constitute an endorsement by Statistics Canada.
- Fisheries Management Zones, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
- Bathymetry lines and survey index, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
Bertha Lake is 9.1 m deep at its deepest point, shallower than 76% of the 2,688 surveyed lakes in Ontario. It covers 13.5 km² and lies 21 km east of Swain Post.
- Maximum depth
- 9.1 m
- shallower than 76% of the 2,688 surveyed lakes in Ontario
- Area
- 13.5 km²
- larger than 96% of the 18,731 lakes in Ontario
- Shoreline
- 55.7 km
- longer than 96% of the 18,731 lakes in Ontario
- Elevation
- 400 m
Sun and moon today
- Civil dawn
- 6:49 a.m.
- Sunrise
- 7:23 a.m.
- Sunset
- 6:28 p.m.
- Civil dusk
- 7:01 p.m.
- Moonrise
- 6:15 a.m.
- Moonset
- 5:47 p.m.
- Moon
- Waning crescent, 1% lit
Depth
57% of Bertha Lake is shallower than 3 m, and 27% is deeper than 5 m.
How to read it: the lake’s area is sorted from the shore to the deepest point. Where the curve is flat, large areas share one depth (flats and weed beds); where it drops, depth changes quickly (drop-offs).
The government depth survey records a maximum depth of 9.1 m, drawn from 82 depth contours.
- Download the depth map (SVG)Printing this page gives the map on one sheet, with scale and sources.
Not for navigation. Depths are from government surveys and may be outdated.