How many principal ports are located on Lake Ontario?

Lake Ontario is home to a number of principal ports, which are vital for commerce, transportation, and recreational activities. The correct answer indicates that there are five principal ports on Lake Ontario. This includes major ports such as Kingston, Toronto, Hamilton, St. Catharines, and Oswego. Each of these ports plays a significant role in the economy of the surrounding regions and facilitates a range of maritime activities, including shipping and tourism. Understanding the number and function of these ports can help individuals appreciate the importance of Lake Ontario as a hub for trade and transportation in the Great Lakes system.