Canoe slalom (previously known as whitewater slalom) is a competitive sport with the aim to navigate a decked canoe or kayak through a course of hanging downstream or upstream gates on river rapids in the fastest time possible. It is one of the two kayak and canoeing disciplines at the Summer Olympics, and is referred to by the International Olympic Committee (IOC) as Canoe/Kayak Slalom. The other Olympic canoeing discipline is canoe sprint. Wildwater canoeing is a non-Olympic paddlesport. History Canoe slalom racing started in Switzerland in 1933, initially on a flatwater course. In 1946, the International Canoe Federation (ICF), which governs the sport, was formed. The first World Championships were held in 1949 in Switzerland. From 1949 to 1999, the championships were held every odd-numbered year and have been held annually in non-Summer Olympic years since 2002. Folding kayaks were used from 1949 to 1963; and in the early 1960s, boats were made of fiberglass and nylon. Boats were heavy, usually over 65 pounds (30 kilos). With the advent of kevlar and carbon fiber being used in the 1970s, the widths of the boats were reduced by the ICF, and the boats were reduced in volume to pass the gates, and boats have become much lighter and faster. From 1949 to 1977, all World Championships were held in Europe. The first World Championship held in North America was held at Jonquière, in Québec, Canada, in 1979. It has been a regular Olympic sport since 1992. In 2020 during the Tokyo Olympics, C2 men loses its status as an official Olympic event and is to be replaced by C1 women. Rules Each gate consists of two poles hanging from a wire strung across the river. There are 18-25 numbered gates in a course, of which 6 or 8 must be upstream gates, and they are colored as either green (downstream) or red (upstream), indicating the direction they must be negotiated. Upstream gates are typically placed in eddies, where the water is flat or moving slightly upstream; the paddler enters an eddy from the main current and paddles upstream through the gate. Downstream gates may also be placed in eddies, to increase the difficulty, and downstream gates in the current can be offset to alternating sides of the current, requiring rapid turns in fast-moving water. Most slalom courses take 80 to 120 seconds to complete for the fastest paddlers. Depending on