Ontario Base Maps (OBM) are a series of maps created and updated by the Ontario Ministry of Natural Resources between 1977 and 2000. The MNR extracted the 33 layers from their NAD83 NRVIS dataset to create the NAD83 OBM sheets. The maps cover most of Ontario and contain many features normally found on topographic maps such as relief, hydrography, vegetation and roads. Southern Ontario has 1:10,000 scale maps covering 25 km² and Northern Ontario has 1:20,000 scale maps covering 100 km².

We make the entire library of Ontario Base Maps available online on our MapWarehouse for immediate download. The maps are available in a variety of formats; PDF, DWG, ShapeFile and GeoTiff files can be purchased and downloaded for use.

• Vegetation
• Marshlands
• Lakes, reservoirs and rivers
• Trails
• Access roads
• Road edges
• Road edges under construction
• Road center lines
• Feature outline / parking lot
• Aerial cableway
• Airstrip
• Rail line
• Provincial boundaries
• National parks
• Surveyed lines
• Township lots
• Turntable railways
• Pits and piles
• Bridge roads / rails
• Tunnel roads

• Beaver dams
• Dikes
• Locks
• Flow directions
• Rocks
• Rapids / falls
• Buildings to scale / Buildings
• Fences / wall
• Pipelines
• Transmission lines
• Hedges
• Mileposts
• Horizontal control points
• Smoke stacks
• Electrical substation
• Mine headframes
• Tank water / petroleum
• Towers
• Land contours / Approximate land contours