Point Lonsdale

High risk: Strong tidal currents

The Grotto sits on the Lonsdale Wall where powerful tides flow between the bay and Bass Strait. Snorkel only on slack tide.

High risk: Strong tidal currents (The Rip)

Port Phillip Heads experience extreme tidal currents up to 9 knots, especially around the channel between Point Lonsdale and Point Nepean. Snorkel only on slack tide.

High risk: Strong tidal currents at The Rip

The outer limits of the park at Point Lonsdale can be subject to strong currents when water is moving in and out of The Heads at Port Phillip. These currents can be dangerous and unpredictable.

Moderate risk: Boat traffic

The area near the Point Lonsdale channel sees vessel traffic. Stay aware and avoid the main shipping channel.

Moderate risk: Boat traffic / shipping channel

The site lies adjacent to the main shipping channel into Port Phillip Bay. Boats and large vessels frequent the area year-round.

Moderate risk: Swell and surge

Exposed to Bass Strait swell, creating surge on the reef and rock shelves that can dislodge or exhaust snorkellers.

Moderate risk: Deep water near channel

Deep water zones adjacent to the reef can catch snorkellers off guard, with potential for strong undertow.

Low risk: Cold water temperatures

Southern Ocean influence keeps water temperatures cool year-round, typically 12–18°C. A wetsuit (5mm+) is essential.

Low risk: Variable visibility

Swell and tidal flow can stir up sediment, reducing visibility significantly. Check conditions before entering.

Low risk: Exposed reef platforms

Sharp reef edges and barnacle-covered rocks on entry/exit points can cause cuts and scrapes. Wear booties.

Low risk: Cold water temperature

Water temperatures range from 10-19°C depending on season. Cold shock and hypothermia risk without appropriate wetsuit (5-7mm recommended).

Low risk: Sharp reef and marine life

Rocky reef with barnacles, mussels and sharp limestone edges that can cause cuts and scrapes if touched.