Volvo Ocean Race’s six-strong fleet enters one of the most hazardous phases of the nine-month, round-the-world event in the next 24 hours when it will reach the Malacca Strait on the third leg from Abu Dhabi to Sanya, China.

The 500-nautical mile (nm) stretch of water, which separates the Indonesian island of Sumatra and Malaysia, narrows to 1.5nm as it funnels past Singapore into the South China Sea and is one of the busiest shipping lanes in the world.

It is notorious for the huge mountain of man-made debris that has been dumped there.

The Volvo racing boats have had to dodge discarded washing machines and fridges in past editions of the 38,739nm, 41-year-old event, which is held every three years.

There are huge tankers to avoid plus dozens of slow moving or stationary fishing vessels to navigate around and their nets can easily become snagged in the boats’ keels.

“There are loads of hazards,” added Britain’s Dee Caffari, of Team SCA, the only all-women crew in the fleet and the first to enter the male-dominated race for 12 years.

“Everyone always talks about the Malacca Strait. Tidal influences, land influences, fishing and shipping vessels. It’s going to be pretty full on,” she told reporters from the boat.

The 4,670-nautical mile leg is led by Chinese boat Dongfeng Race Team.

Victory in Sanya around January 27-28, the likely arrival dates of the leaders, would take Dongfeng top of the overall standings in the race.

The race, which started on October 4 in Alicante, Spain, is scheduled to finish in Gothenburg, Sweden on June 27.