The Walk
Cape Jervis is where the Heysen Trail begins — kilometre zero of a 1,200 km marked track that ends at Parachilna Gorge in the Flinders Ranges. There’s something about standing at the southern trailhead with the Backstairs Passage stretching out ahead and Kangaroo Island on the horizon that focuses the mind. Even if you’re only here for a day walk, you’re starting at the beginning of something very large.
The Cape Jervis to Cobbler Hill section runs 14 km through some of the most spectacular — and most remote — coastal terrain on the Fleurieu Peninsula. It tracks southeast from the ferry terminal through exposed clifftop heath above Backstairs Passage, drops to sea level at Blowhole Beach, enters Deep Creek National Park, then makes a sustained final climb to Cobbler Hill at 268 m. Total ascent over the route is 726 m — the coastal undulation adds up despite most of the route appearing flat on a map.
This is a serious walk. The exposure, the lack of water, the clifftop conditions, and the final climb combine to make it genuinely demanding. It’s also, in the right conditions, one of the most beautiful stretches of walking in South Australia.
Cape Jervis and the Opening Stretch
Cape Jervis is a working coastal township — the Kangaroo Island ferry terminal, a general store, a pub and not much else. The Heysen Trail southern trailhead marker is near the foreshore. Fill water bottles here. Genuinely fill them. This is the last point of any certainty before Cobbler Hill.
The opening kilometre or two tracks southeast from the township on a formed foreshore path before picking up the clifftop. The ground rises gradually, the township falls behind, and the Backstairs Passage opens up to the left. From this point the walk earns its scenery rating.
The Coastal Section — Backstairs Passage
This is the centrepiece. For roughly 8 km the trail follows the clifftops above the Backstairs Passage — the narrow strait between the Fleurieu Peninsula and Kangaroo Island. The walking is exposed single track through coastal heath: dense low-growing native vegetation, wind-sculpted shrubs, and the occasional rush of cool onshore air from the Southern Ocean below.
Kangaroo Island sits on the horizon throughout this section, roughly 13 km away across the passage — close enough to see the cliff faces and headlands clearly on a good day. The passage itself is a wildlife corridor: dolphins pass through regularly, and from June to October southern right whales use these waters as they migrate. New Zealand fur seals haul out on rocky platforms at the base of the cliffs below the clifftop trail. Bring binoculars.
The clifftops are fully exposed and the trail demands some care — stay back from unfenced edges, the rock can be crumbly, and in strong onshore winds the section is challenging for the wrong reasons. The best conditions for this walk are a calm, clear morning in the cooler months.
Blowhole Beach
Around the 9.5 km mark the trail descends to near sea level at Blowhole Beach — the lowest point of the walk and one of the more remote beaches on the Fleurieu coast. The descent from the clifftops to the beach level is abrupt and gives the walk a distinct change of character: from open and exposed to sheltered and intimate. This is the natural break point for the walk — roughly two-thirds of the distance, with the biggest terrain challenge (the Cobbler Hill climb) still ahead.
The beach itself is wild. There’s no safe swimming — the Southern Ocean shore break here is powerful — but the setting is remarkable.
Deep Creek National Park and the Cobbler Hill Climb
From Blowhole Beach the trail enters Deep Creek National Park. The vegetation changes immediately: denser native scrub, banksia, and the sheltered character of the park interior after the exposed coastal section. Deep Creek is one of South Australia’s most significant coastal national parks, protecting some of the last intact native bushland on the Fleurieu Peninsula.
The final 2 km is the Cobbler Hill climb — a sustained push from near sea level to 268 m through dense native scrub. The gradient is real. After 12 km of coastal walking the legs will feel it. The trail is well-defined but demands a final effort before the Cobbler Hill car park comes into view.
Highlights
- Kilometre zero of the Heysen Trail — the beginning of Australia’s longest waymarked walking track
- Backstairs Passage clifftop views with Kangaroo Island on the horizon throughout the coastal section
- Dolphins, fur seals and (in season) southern right whales from the clifftops
- Blowhole Beach — wild, remote, and a natural midpoint break
- Deep Creek National Park — intact coastal scrub and the most pristine bush on the Fleurieu
Bottom Line
Cape Jervis to Cobbler Hill is the ideal first encounter with the Heysen Trail proper — remote, dramatic, and demanding enough to make you understand why this trail has the reputation it does. The logistics (shuttle, no water, exposed clifftops) require planning, but the reward is a walk that feels genuinely consequential. You start at the edge of the continent and you earn every metre of the climb to Cobbler Hill.
Rating: 4.5 / 5 — One of the best hard day walks on the Fleurieu Peninsula, best in autumn or spring with a calm sea and a clear morning horizon to Kangaroo Island.
Distance, elevation and surface type are derived from a GPS-recorded track. Figures are a close guide rather than survey-grade data — coastal terrain undulation contributes significantly to the cumulative ascent figure. See How Accurate Is Our Trail Data? for detail.