The American falls are 64 m high and 305 m wide, with a flow of 14 million litres of water per minute. The Canadian, or Horseshoe, Falls are 54 m high and 675 m wide, with a flow of 155 million litres. With tourism, which began in the 1800s, came daredevils who defied the falls in barrels, boats and rubber balls. Stunting was outlawed in 1912. Millions of tourists visit the area every year, viewing the falls from several towers, a tunnel beneath Horsehoe Falls, an aerocar over the whirlpool and the Maid of the Mist, a boat that carries sightseers to the foot of the falls.
International agreements control the diversion of water for hydroelectric power.
No 1 and No 2 by canals and tunnels.