St. Croix River (ME) Quiz
Coastal Maine basin, border geography, watershed (10 questions).
St. Croix River (ME) Quiz: Quick Study Notes
The St. Croix River, a critical waterway marking a significant portion of the international boundary between Maine (USA) and New Brunswick (Canada), is more than just a line on a map. Its basin is a vibrant ecological system, flowing through coastal Maine into Passamaquoddy Bay, and its watershed supports diverse wildlife and historical industries. This quiz explores the unique geography, border dynamics, and ecological importance of this fascinating river system.
Key Geographical Aspects
The St. Croix River forms a key segment of the U.S.-Canada border, specifically between Maine and New Brunswick, as defined by treaties like the Webster-Ashburton Treaty.
It drains a region of eastern Maine, emptying into the Passamaquoddy Bay, which is part of the larger Bay of Fundy/Gulf of Maine system, known for its extreme tides.
The river’s watershed is characterized by a series of interconnected lakes and streams, providing habitats for migratory fish and historically supporting a robust timber industry.
The river holds deep historical and cultural importance for Indigenous peoples, particularly the Passamaquoddy Tribe, whose ancestral lands encompass the lower river and bay.
Key Takeaways
- The St. Croix River is a crucial international boundary between Maine, USA, and New Brunswick, Canada.
- Its course was historically contentious and ultimately defined by the Webster-Ashburton Treaty of 1842.
- The river flows into Passamaquoddy Bay, a sub-basin of the Bay of Fundy, known for its significant tidal range.
- The watershed is a mosaic of lakes, streams, and forests, providing vital habitat for migratory fish like Atlantic salmon and alewives.
- Calais, Maine, is a major U.S. town situated at the mouth of the river, acting as a key border crossing.
- The region has a rich history tied to the timber industry and the cultural heritage of the Passamaquoddy Tribe.
- The river’s ecosystem is a focus for conservation efforts, balancing resource management with environmental protection.
Frequently Asked Questions
Where is the St. Croix River located?
The St. Croix River is located in eastern Maine, USA, and western New Brunswick, Canada. It forms a significant portion of the international border between the two.
What is the primary significance of the St. Croix River geographically?
Its primary geographical significance is serving as an international boundary river. It also drains into Passamaquoddy Bay, an ecologically important coastal basin.
Which major body of water does the St. Croix River eventually flow into?
The St. Croix River flows into Passamaquoddy Bay, which is an inlet of the larger Bay of Fundy and Gulf of Maine.
What historical event is tied to the St. Croix River’s boundary status?
The river’s status as a boundary was a point of contention after the American Revolution and was finally settled by the Webster-Ashburton Treaty of 1842.
Are there any major towns or cities on the St. Croix River?
Yes, the city of Calais, Maine, and the town of St. Stephen, New Brunswick, are prominent communities located opposite each other on the lower St. Croix River.

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