What is a notable characteristic of the navigational approach to the St. Lawrence River from Lake Ontario?

A notable characteristic of the navigational approach to the St. Lawrence River from Lake Ontario is the presence of significant shoals. Shoals are shallow areas in the water that can pose hazards to navigation, especially for larger vessels. Mariners need to be aware of these shoals when plotting their courses to avoid grounding or potential damage to their vessels. Navigating through areas with shoals requires expertise and familiarity with local charts, which provide details on depths and navigable routes.

While it is true that the area may have heavily trafficked sections, the presence of significant shoals remains a critical concern for navigators. Understanding the risks associated with shoals is vital for safe navigation in this region, making it a key characteristic of the approach to the St. Lawrence River.