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Open-water swimming

Points

Eight real venues from Channel starts to Olympic marathon courses.

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Quick answers

Which local rescue or training agency should I check first?

Use the local lens: coastguard/federation norms and the shop briefing for that bay — not a blog visibility claim.

When did the Olympics add marathon swimming?

The 10 km open-water event debuted at the 2008 Beijing Games, held at the Shunyi rowing-canoeing park.

Who first swam the English Channel?

Matthew Webb swam Dover to Calais in 1875. The Channel remains the most famous ratifying-body swim, under rules later formalised by the CSA and CLSA.

Are wetsuits allowed in races?

World Aquatics and World Triathlon set temperature bands. Below a threshold wetsuits may be required or permitted; above it they are often banned. Always read the event’s rule sheet.

What is sighting?

Lifting the eyes to pick a landmark or buoy without breaking the stroke. It is the skill that replaces the black line.

Is a pool 1,500 m enough preparation?

It is necessary and not sufficient. Currents, chop, cold and navigation only appear outdoors.

Start with this section - Points

Famous open-water sites are a mix of ratification swims, Olympic courses and municipal lakes. Typical seasons below are planning bands, not a promise of flat water.

Permissions, ferry wakes and algal closures change. Organisers and park services publish the live sheet.

Points

Shakespeare Beach / Dover

Kent, UK · surface swim · Channel variable · Jul–Sep peak attempts

The classic English Channel start. Ratified solos remain a support-boat expedition, not a casual dip.

Alcatraz crossing

San Francisco Bay, USA · surface · cold, current · late summer events

Alcatraz-to-Aquatic Park swims are a named current-and-cold problem; club events run with strict cut-offs.

Lake Zurich

Switzerland · surface · lake, often good · Jul–Aug events

Home of a famous marathon lake race; a model of European organised open water with feeding and boat cover.

Waikiki Roughwater

Oahu, Hawaii · surface · ocean swell · Sep typical

A point-to-point ocean swim dating to 1970; swell and current make it a different sport from a lake 2 km.

Serpentine

London, UK · surface · lake urban · summer club / events

Hyde Park’s lake hosts the Serpentine Swimming Club (1864) and was the 2012 Olympic marathon venue.

Lac St-Jean

Quebec, Canada · surface · large lake · summer crossing

A historic professional crossing and festival swim; cold Canadian lake water even in August.

Paris Seine Olympic course

Paris, France · surface · river urban · event windows

The 2024 Olympic 10 km used the Seine after a long water-quality project — a river swim with current and bridges.

Rottnest Channel

Western Australia · surface · ocean crossing · Feb event

The Rottnest Channel Swim is a mass crossing from Perth to the island, famous for boats, smacks of jellyfish, and heat.

Tips

The famous crossings are expeditions. Most people should collect marked lake loops before they collect Channel folklore.

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