Helen Rock is a reef located in the coastal waters off Warrnambool, Victoria, along the Great Ocean Road. It is situated approximately one kilometer offshore from the mainland. The reef reaches a depth of around 20 meters, indicating a significant underwater structure. Access to Helen Rock is exclusively by boat, as no shore access points exist. For paddlers, this means any trip requires a launch from a nearby coastal access point, such as Warrnambool's breakwater or Stingray Bay, followed by a substantial open-water crossing. The marine environment is known for its rich underwater life, including crayfish, stingrays, moray eels, and various fish species, which can be observed by paddlers looking into the clear water. The area is part of a region frequented for diving and is noted for providing excellent underwater photography opportunities due to its marine life and reef structure.

The paddling conditions are heavily influenced by ocean weather. The sea terrain in this vicinity is rough, and the site is best appreciated during excellent weather conditions. It is considered suitable for intermediate to advanced water users due to these potential hazards. Paddlers must be prepared for exposure to wind, swell, and currents common in the Bass Strait, and the one-kilometer crossing to the reef presents a significant commitment away from sheltered waters. The presence of other boat traffic accessing the dive site is likely. There are no specific facilities or amenities at the reef itself. The overall character is that of an exposed offshore marine feature offering a view of a dynamic coastal environment, suitable only for experienced paddlers with appropriate skills, equipment, and a careful assessment of the marine forecast.