This is the relevant information: The Saint Lawrence River flows in a roughly north-easterly direction, connecting the Great Lakes with the Atlantic Ocean and forming the primary drainage outflow of the Great Lakes Basin.
This justifies what answer for what question? Q & A:
Passage: The Saint Lawrence River (French: Fleuve Saint-Laurent; Tuscarora: Kahnawa'kye; Mohawk: Kaniatarowanenneh, meaning "big waterway") is a large river in the middle latitudes of North America. The Saint Lawrence River flows in a roughly north-easterly direction, connecting the Great Lakes with the Atlantic Ocean and forming the primary drainage outflow of the Great Lakes Basin. It traverses the Canadian provinces of Quebec and Ontario, and is part of the international boundary between Ontario, Canada, and the U.S. state of New York. This river also provides the basis of the commercial Saint Lawrence Seaway.

Question: Based on this passage, which way does the st. lawrence river flow?
a roughly north - easterly direction