Great Lakes Basin Hydrographic & Boundary Map

International Boundary Waters Treaty (1909)

Lake Ontario (Ontari'io)

Binational Treaty Waters (52% CA / 48% US)

Smallest Great Lake by surface area, but second deepest. Bilaterally partitioned with the international border passing lengthwise through the water body under the 1909 Boundary Waters Treaty.

52% CAN

48% USA

🇨🇦 Canadian Sovereign Waters: 🇺🇸 US Sovereign Waters:

Surface Area

18,960 km²

(7,340 sq mi)

Shoreline Length

1,146 km

54% CA / 46% US

Water Volume

1,640 km³

393 cu mi

IJC Treaty Status

Art. IV Equal Rights

1909 Treaty Governed

Historical & Indigenous Origin: From the Wyandot (Huron) word Ontari'io meaning "great sparkling lake" or "magnificent water". Named prior to 1641 in early New France cartography (Champlain, 1632).

Basin-Wide Sovereignty Breakdown

Shared Binational Lakes

Superior, Huron, Erie, Ontario

Domestic US Lakes

Lake Michigan wholly in US

Total Basin Water Share

60% US / 40% CA

Including Lake Michigan

Treaty Authority

IJC Bilateral

Joint Commission since 1909

Dynamic Great Lakes Mnemonic Engine

Active: HOMES

The standard pedagogical acronym taught across North America is H-O-M-E-S (Huron, Ontario, Michigan, Erie, Superior). Test renaming proposals below to observe anagram permutations, phonetic pronounceability, and geographic ordering.

Active Acronym Letters:

Possible Anagram Permutations:

Test Custom Name for Lake Ontario:

International Naming Authority Matrix

Body / Treaty	Jurisdiction	Authority over Lake Ontario
US Board on Geographic Names (BGN)	Federal US Cartography only	Can alter domestic US federal maps; has zero authority in Canada or international maritime law.
Geographical Names Board of Canada (GNBC)	Canadian Official Toponymy	Sole official recognition body for Canadian half (52%); retains constitutional jurisdiction with Ontario province.
1909 Boundary Waters Treaty & IJC	Bilateral US-Canada Water Bodies	Codifies mutual equality, environmental stewardship, and binational waterway management.
UNGEGN (United Nations)	Global Standardization of Toponyms	Recommends mutual consensus on cross-border transboundary features; unilateral renaming is treated as local exonym only.

Treaty Conclusion: Shared bilateral jurisdiction under 1909 Boundary Waters Treaty; unilateral domestic names apply only to federal US maps and lack Canadian or international recognition.

Pre-Colonial Indigenous Etymology Registry

Lake	Indigenous / Historic Term	Linguistic Origin & Meaning
Superior	Gichigami / Ojibwe	"Great Sea" / French: Lac Supérieur ("Upper Lake", referring to geography north of Huron).
Michigan	Mishi-gamiing / Ojibwe	"Great Water" or "Large Lake". Entirely within US borders since 1837 statehood.
Huron	Karegnondi / Wyandot	"Freshwater Sea". Later named 'Huron' by French traders after the Wyandot hairstyle.
Erie	Erielhonan / Iroquoian	"Long Tail", referencing the cougar/cat totem of the indigenous Erie people.
Ontario	Ontari'io / Wyandot	"Great Sparkling Lake" or "Beautiful Water". Continuous recorded cartographic use for >380 years.

Export Sovereignty Dossier

Generate and download a comprehensive bilateral legal assessment, hydrographic data split, and nomenclature analysis.