Journey along Portland’s stunning southwest coastline on this 4-hour tour to the Cape Bridgewater Seal Caves, where hundreds of fur seals bask on rocky ledges and dive effortlessly through crystal-clear waters. This dynamic stretch of coastline is home to dramatic cliffs, secluded bays, and remarkable wildlife encounters.

As we cruise past Lawrence Rocks and the towering volcanic formations of Cape Nelson, you'll explore hidden sea caves and witness unique geological features shaped by the relentless power of the Southern Ocean. It's a striking blend of raw nature and ancient landforms, visible only from the sea.

These nutrient-rich waters, fuelled by the Bonney Upwelling, support a thriving marine ecosystem—seals, seabirds, dolphins, and even apex predators all coexist here in a vast underwater Serengeti. With Shoreline Charters’ expert crew guiding the way, you’ll gain a deeper understanding of the interconnected life systems that make this one of Australia’s most extraordinary marine environments.

Explore the rich ecosystem of Lawrence Rocks, home to over 8,000 nesting Australasian gannets, Australian fur seals, and a wide variety of seabirds. Watch as gannets dive in spectacular feeding frenzies, and seals lounge on the rocky outcrops of this offshore sanctuary.

As we cruise through these nutrient-rich waters, you may also spot pods of dolphins working together to herd and hunt schools of fish, a remarkable display of ocean intelligence and teamwork.

This 2-hour tour offers an up-close look at one of Portland’s most vibrant marine wildlife hubs, guided by locals who know where nature comes alive.

Discover the wild, volcanic island of Deen Maar (Julia Percy Island)—a remote marine sanctuary and home to the largest Australian fur seal colony in the Southern Hemisphere. Situated within the nutrient-rich waters of the Bonney Upwelling, this offshore hotspot teems with life, where seals, seabirds, dolphins, and even ocean giants move through a thriving underwater Serengeti.

Deen Maar is also known as prime territory for great white sharks, naturally drawn to the massive seal population. The chance to explore an ecosystem where apex predators and prey coexist is truly unforgettable.

On this 4-hour tour, you’ll cruise aboard our quiet, purpose-built vessel, designed for stability and comfort in open waters. With expert local crew onboard, you’ll gain deep insight into the island’s marine life, geology, and cultural significance—all from those who know these waters best.