Saint Lawrence

• Saint Lawrence proper · ≈1,200 km

  Lake Ontario to Anticosti Island; not the displayed Montréal–Québec reach and not the Great Lakes whole system.

• Illustrated reach · Montréal–Québec reach
• Great Lakes–Saint Lawrence basin · ≈1.61 million km²

  Full Great Lakes–Saint Lawrence drainage system; neither the Montréal–Québec selection nor the basin at Québec.

• Mean flow at Québec · ≈12,600 m³/s

  Published mean at Québec by the Canada–Québec Saint Lawrence Action Plan; historical contextual mean, not present-day flow or a new station calculation. Averaging period is not supplied by this overview.

• System tributaries · 244

  Tributaries listed in the Saint Lawrence Action Plan system overview; not a count of tributaries or mapped source features within the Montréal–Québec artwork reach.

• Origin → natural outlet · Lake Ontario → Gulf

  Gulf of Saint Lawrence; the 1,200 km metric specifically ends at Anticosti Island.

• Commission de toponymie du Québec
• Gouvernement du Québec, Hébert and Belley
• Canada–Québec Saint Lawrence Action Plan
• Facts: Commission de toponymie / Québec water-quality report / Plan d’action Saint-Laurent · Map: GRHQ, Gouvernement du Québec, CC BY 4.0; selected and adapted · Context: Natural Earth
• CC BY 4.0

Decorative artwork, not a navigation chart. Mapped shorelines and extents are approximate; historical or modeled data are labeled.

Visual guidance · Paper proof pending.