

Some waterfalls you look at. These three you feel: the ground trembles, the mist soaks you a hundred meters away, and the roar drowns out everything else. They also share a trait: each one sits on a national border, which means every one of them has two sides worth seeing.
Niagara Falls, USA and Canada
The most famous waterfall in North America is really three: Horseshoe Falls, the American Falls, and Bridal Veil Falls, straddling the US Canada border. It is also the easiest of the three to reach: about 130 kilometers from Toronto, roughly 90 minutes by car, with GO trains, buses, and guided day tours running from downtown, so a day trip is straightforward. And it is not just a park. The Canadian side keeps the falls in Queen Victoria Park, but the city of Niagara Falls, Ontario wraps around it: the neon amusements of Clifton Hill and two large casinos, Fallsview and Casino Niagara, sit minutes from the water. The views differ by side: Canada faces the Horseshoe Falls head on for the classic panorama, while the US side puts you at the very brink, looking down as the water pours over.
The boat ride into the mist below Horseshoe Falls is the essential experience, and Cave of the Winds puts you on wooden walkways beside the American Falls. At night the falls are floodlit. The trade off is honest: this is the most commercialized of the three, so expect summer crowds, higher prices near the falls, and paid parking. The upside is convenience: the falls are free to view, hotels with falls views are plentiful, and the wineries of Niagara on the Lake are nearby. Best time to visit: May to October, when the boats run and the walkways are open.
Iguazu Falls, Argentina and Brazil
Iguazu is not one waterfall but around 275, stretching nearly three kilometers through jungle, with the Devil's Throat at its center: a U shaped chasm where half the river seems to vanish into spray. The two sides do different jobs. Argentina's park holds the walkways, including the catwalk straight out over the Devil's Throat. Brazil's park holds the panorama, the full sweep in one view. Both sides are UNESCO listed. Best time to visit: August to November for a good balance of flow and comfort; the falls run fullest December to March, which is also the busiest and most humid stretch. Note that the Devil’s Throat catwalk sometimes closes during high water, so check conditions before you go.
Victoria Falls, Zambia and Zimbabwe
The Zambezi River drops 108 meters along a 1,708 meter cliff, making Victoria the largest continuous curtain of falling water on earth. The local name translates as the smoke that thunders, and you understand it when the spray rises hundreds of meters. Zimbabwe's side holds most of the classic viewpoints. Zambia's side holds Livingstone Island and Devil's Pool, the natural rock pool at the very lip, open roughly August to January when the river is low. Best time to visit: February to May for the falls at their most thunderous; August to January for low water and Devil’s Pool.
A practical note
All three are border waterfalls, and the two sides rule holds for each: Niagara from both the US and Canadian sides, Iguazu from Argentina and Brazil, Victoria from Zambia and Zimbabwe. You do not need to move hotels to see both sides: base yourself on one side and day trip the other. Cross border buses, taxis, and tour operators run these routes daily, and same day guided tours cover both parks at Iguazu and both sides at Victoria Falls. If you only have time for one side, pick the one that matches what you want: walkways or panorama, viewpoints or the pool.
Two of the three do the boat into the falls ride properly, and it is worth doing. At Niagara, the Maid of the Mist on the US side and Hornblower on the Canada side sail into the mist at the base of Horseshoe Falls. At Iguazu, Gran Aventura on the Argentina side and Macuco Safari on the Brazil side drive inflatable boats right under the cascades; the Argentina side goes under bigger falls, while the Brazil side offers a drier option and takes all ages. Victoria Falls has no boat ride under the curtain itself; the drenching options there are Grade 5 white water rafting in the gorge below and the Devil’s Pool swim at the lip.
Bring a rain jacket. You will get wet regardless.

