Niagara Falls, one of the most famous waterfalls in the world on the Niagara River, lies on the border between Canada and which of the following countries?

Introduction / Context:
Niagara Falls is a world famous waterfall system known for its impressive volume of water and its role as a major tourist attraction. It lies on an international river that forms part of the boundary between two countries in North America. Many geography questions ask candidates to identify which countries share this landmark.

Given Data / Assumptions:

• The location is Niagara Falls on the Niagara River.

• The question clearly states that one side of the border is Canada.

• The options list various countries from different continents.

• The learner must select the other country that shares the falls with Canada.

Concept / Approach:
Niagara Falls lies on the border between Canada and the United States of America. The falls are split into different sections such as the Horseshoe Falls and the American Falls, which reinforce the idea that the site spans two countries. To answer correctly, learners should remember that the Niagara River connects Lake Erie and Lake Ontario along the Canada–United States border.

Step-by-Step Solution:
Step 1: Recall that Niagara Falls is located in North America, not in any other continent. Step 2: Note that part of the falls is in the province of Ontario in Canada. Step 3: Remember that the opposite side of the falls lies in the state of New York in the United States of America. Step 4: Examine the options and identify U.S.A as the only country that fits this geographical pairing with Canada. Step 5: Choose U.S.A as the correct answer.

Verification / Alternative check:
Any standard atlas or world geography textbook shows Niagara Falls on the border between Ontario in Canada and New York State in the United States. Travel guides describe two main viewpoints: one from the Canadian side and another from the American side. These consistent references across reliable sources confirm that the second country is the United States of America.

Why Other Options Are Wrong:
Australia is a separate continent in the southern hemisphere and does not share any border with Canada. South Africa is located at the southern tip of the African continent and likewise has no connection with Niagara Falls. The United Kingdom lies across the Atlantic Ocean from Canada and does not form a land border with it. New Zealand is in the South Pacific and has no geographical link to Canada or the Niagara River. Hence, none of these options fit the description given in the question.

Common Pitfalls:
The main error arises when learners fail to recall that the falls are on an international border and instead focus only on one country, often Canada, which may lead to confusion if the question is worded differently. Another pitfall is to misinterpret maps or photographs and imagine that the falls belong entirely to one nation. Careful revision of North American geography, especially the Great Lakes and their connecting rivers, helps avoid such mistakes.

Final Answer:
Niagara Falls lies on the border between Canada and the United States of America (U.S.A).