Kool-a-Sun Marina Mile

While world-famous swells break along the rocky points of Jeffreys Bay, the sheltered canals of Marina Martinique offer mirror-flat, 25-degree salt water without a trace of current or tidal push. The Kool-a-Sun Marina Mile is an open water swimming race held in this quiet network of saltwater canals in Jeffreys Bay, along South Africa's Eastern Cape coast. Organized by Zsports Events SA, the gathering takes place in late December, offering an ideal mid-summer escape where swimmers trade the rough ocean surf for protected, sun-warmed channels. The headline event of the day is the 1,600-metre mile, which leads swimmers along a sheltered course between palm-fringed banks. Because the canals are isolated from tidal flow and ocean surges, the course creates a fast, predictable aquatic track where competitors can lock into their stroke without fighting chop.

Past editions have enjoyed pristine conditions with water temperatures reaching 25 degrees under sunny summer skies. Alongside the mile, the event program has featured novice-friendly bank-to-bank dashes that welcome young and developing swimmers, as well as an accompanying 5-kilometre beach run along the nearby sands.

Marina Martinique: the clear saltwater canals behind the dunes

Marina Martinique is an upscale residential estate constructed around an extensive, engineered network of waterways set just back from the ocean in Jeffreys Bay. Rather than swimming in murky lake water or battling the heavy shorebreak of the open coast, athletes compete in clear blue salt water surrounded by neat embankments and swaying palms. The canals provide all the buoyancy of the ocean without any of its volatility. Because the channels are entirely sheltered from currents and tides, the water remains dead flat, offering exceptional visibility down into the blue and effortless sighting toward each turn. It is the kind of calm water that allows novice open water swimmers to build confidence while giving experienced racers the chance to post pure speed benchmarks without the resistance of shifting tides.

Kabeljous and Seekoei: the coastal estuaries and birdlife

Beyond the engineered canals of the marina, the coastline surrounding Jeffreys Bay is defined by a series of rich natural river mouths and protected wetland sanctuaries. Just up the coast lies the Kabeljous Nature Reserve, home to one of the best preserved estuaries in the Eastern Cape. A short distance away, the Seekoei River Nature Reserve spans the serene estuary formed where the Seekoei and Swart rivers meet the coastal plain. These estuarine reserves are critical wildlife habitats, with the Seekoei reserve alone supporting more than 120 species of resident and visiting birds. Outside of race day, the calm expanses of the Kabeljous and Seekoei lagoons, together with the nearby Krom River lagoon, serve as popular gathering spots for boardsailing, canoeing, and peaceful coastal fishing. For those looking out toward the horizon, the open sea fronting these lagoons offers regular sightings of migrating whales breaching near the coast during their transit along the Cape shoreline.

The Krom River and the surf breaks of Jeffreys Bay

Flowing for roughly 109 kilometres from an extensive inland catchment of over a thousand square kilometres, the Krom River feeds major water reservoirs at the Churchill Dam and the Impofu Dam before opening into the Indian Ocean on the northern edge of St Francis Bay. The river supports unique aquatic life, including endemic Cape galaxias fish discovered in its waters in 1995. Swimmers compete within completely enclosed, manmade canal walls that remain safely isolated from the open estuary, free from marine predators, and untroubled by river currents or ocean tides.

Between these wild estuaries lies the famous shoreline that made the town a global watersports hub. Supertubes Beach is known across the world for its right-hand point break. After finishing a warm mile through the placid saltwater canals of the marina, swimmers can head to the shoreline to watch the swell roll across the outer points under the summer sun.