Ontario Legal Land Description Guide — Lots & Concessions

Ontario's land description system stands apart from the western provinces. Where Alberta, Saskatchewan, and Manitoba organize land through the Dominion Land Survey (DLS) — a uniform rectangular grid tied to fixed meridians — Ontario uses a geographic township system built on named townships, numbered concession strips, and sequential lot numbers. The system was developed during Ontario's colonial survey era, beginning in the 1780s, and reflects a different set of survey priorities: access to water, connection to settlement routes, and the practicalities of surveying forested, lake-studded terrain.

If you come to Ontario land descriptions from a western Canadian background, the biggest conceptual shift is this: instead of a province-wide grid with coordinates tied to numbered meridians, Ontario parcels are located by township name first, then by their position within that township's internal concession-and-lot grid.

The Geographic Township System

Ontario is divided into several hundred named geographic townships. Each township is an administrative and survey unit — roughly 10 to 12 miles square in the older-surveyed south, somewhat less consistent in the north. Township names typically reflect British colonial geography (McNab, Ramsay, Beckwith, Drummond), Indigenous place names (Algoma, Nipissing, Manitoulin), or settler communities (Guelph Township, Brock, Southwold).

Within each township, land is organized into two dimensions:

Concession Strips

Concessions are horizontal strips of land running east-west (or sometimes parallel to a river or lake) across the township. They are numbered sequentially from the front (south or lake-facing) of the township toward the rear. Most townships have between 10 and 14 concessions, though some older or irregularly shaped townships differ. Concessions are sometimes designated by Roman numerals (Concession I, II, III) in older documents.

Lot Numbers

Within each concession strip, lots are numbered sequentially from east to west (or from the baseline of the township). Each lot is typically 200 acres in the standard "double-front" system, but lot sizes vary considerably across different survey regimes (single front, double front, broken front for irregular lakeshore or river lots).

A complete Ontario land description looks like this:

Lot 15, Concession 3, Township of McNab, County of Renfrew

This identifies the 15th lot in the 3rd concession of McNab Township (now part of McNab/Braeside in the Ottawa Valley), at approximately 45.43°N, 76.65°W.

For guidance on converting lot and concession references to GPS coordinates, see the Ontario lot and concession lookup guide.

Survey History and Regional Variation

Ontario's survey history spans more than two centuries, and different regions of the province were surveyed at different times using different conventions. This creates meaningful variation across the province:

Southern Ontario (Pre-1825)

The older-surveyed townships in the southern peninsula, the Ottawa Valley, and eastern Ontario tend to follow the double-front survey system, where each lot has two road allowances and a nominal 200-acre size. These townships have well-documented concession and lot structures, and their boundaries are registered in the Ontario land registry system going back to the original Crown grants.

Northern Ontario (Post-1870)

Northern Ontario townships were often surveyed later, sometimes in conjunction with mining activity (Sudbury Basin, Thunder Bay silver district, Cobalt) or the construction of the Canadian Pacific Railway. Some northern townships use a single-front survey layout. Many townships in the far north were surveyed incompletely or not at all, and land tenure is managed through other mechanisms including unpatented Crown land.

Broken Lots and Shore Allowances

Lots that front on a lake, river, or other body of water are often designated as "broken lots" — lots that don't conform to the standard rectangular shape because they are truncated by the shoreline. Shore allowances (typically 66 feet wide) were reserved along navigable waters during the original surveys, and these show up in historical title descriptions. A broken front concession is common along Lake Ontario, Lake Erie, Lake Huron, and the major rivers.

Example Coordinates

Ontario vs. Western DLS: Key Differences

The lack of a province-wide grid means you cannot look up an Ontario parcel without knowing its township name. "Lot 15, Concession 3" is meaningless without the township. This is the most important difference to internalize when moving from western to Ontario land descriptions.

Regulatory Context

Ontario Land Registry Office

Ontario's land titles and deeds registry is administered by ServiceOntario through a network of Land Registry Offices (LROs), one per county or district. Each LRO maintains title records indexed by the lot, concession, and township description. The province has converted most of its registry to the electronic Land Registration Information System (LRIS), but the underlying parcel identifiers remain lot/concession references in the older-surveyed areas.

For properties in municipalities that have been subdivided (plan of subdivision), the registered plan of subdivision number and lot number replace the original lot/concession description for legal purposes — though the original township description often still appears in chain-of-title documentation.

Ministry of Northern Development, Mines, Natural Resources and Forestry

Ontario's mining claim system uses the geographic township as its base unit. Mining claims are recorded as "units" within a geographic township using a grid of cells overlaid on the township's lot-and-concession structure. The MNDMNRF's online claim registration system (Ontario Mining Act, administered through the Mining Land Administration System, or MLAS) requires claimants to identify their target township. The mining industry guide covers how Ontario mining claims relate to the geographic township system.

MPAC (Municipal Property Assessment Corporation)

MPAC administers property assessment across Ontario for municipal taxation purposes. Every assessable property in Ontario has a Roll Number, and the underlying parcel is identified in MPAC's database using both the registered legal description (lot, plan, concession) and a PIN (Property Identification Number) from the provincial Parcel Register.

Key Industries in Ontario That Use Legal Land Descriptions

Real Estate and Land Development

Southern Ontario has some of the highest-value agricultural and residential land in Canada. Land title transactions, easement registrations, mortgage instruments, and severance applications all require precise lot and concession references. A developer proposing a rural severance near Barrie, for example, needs to correctly identify the parent lot (e.g., Lot 7, Concession 2, Township of Innisfil) and the proposed severed parcel description before applying to the local land division committee. The real estate industry guide covers these workflows in detail.

Mining and Exploration (Northern Ontario)

The Canadian Shield exposed across Northern Ontario hosts significant gold, copper, nickel, and other mineral deposits. The Sudbury Basin (nickel, copper), the Timmins-Porcupine camp (gold), the Cobalt district (silver, cobalt), and the Ring of Fire (chromite, nickel) all involve mining claim registration and exploration project permitting that references geographic townships. Exploration companies working in Northern Ontario need to match their GPS field data against the lot/concession grid to properly identify claim blocks.

Agriculture and Farmland

Ontario's agricultural sector, concentrated in the southwestern peninsula (Essex, Kent, Middlesex, Oxford counties) and the Holland Marsh area, uses lot/concession references for crop insurance, farm program payments, and drainage district assessments. The Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) uses these descriptions in its program databases.

How Township Canada Handles Ontario Descriptions

Township Canada's converter accepts Ontario lot-and-concession descriptions in standard formats:

• Lot 15, Concession 3, Township of McNab
• Lot 15, Con 3, McNab Twp, Renfrew County
• Abbreviated formats: L15 C3 McNab

The converter returns the GPS centroid for the identified lot and renders the approximate parcel boundary on the map. Because lot sizes and shapes vary across Ontario townships, boundary accuracy depends on the precision of the available cadastral reference data for the specific township.

For searching parcels by address and cross-referencing to the underlying lot/concession description, see the find legal land description from address guide.

For bulk processing of Ontario lot/concession descriptions — useful for real estate due diligence lists, mining claim audits, or agricultural program applications — the batch converter handles CSV uploads at scale. See pricing for plan details.

Getting Started

Enter any Ontario lot and concession description into the Township Canada converter, or visit /ontario-geographic-township-converter for an Ontario-configured experience with province-specific examples. For a full explanation of how the lots and concessions system is structured, see the lots and concessions system guide.