Choose the correct combination of articles to complete the following sentences. Niagara Falls are situated on border

Niagara Falls are situated on border between Canada and the USA. They are the most powerful waterfalls in North America and the second most powerful in the world. It is a wonderful and exciting place to visit!!!

Следует помнить, что перед подавляющим числом названий стран артикль the отсутствует.