The Port River estuary forms Australia's largest urban mangrove forest, a 118-square-kilometre sanctuary where grey mangroves grow in tidal silt and Indo-Pacific bottlenose dolphins hunt in channels mere metres from kayak bows. Declared in 2005 after decades of industrial decline along Garden Island's wharves, the Adelaide Dolphin Sanctuary protects habitat for approximately 30 resident dolphins that calve in its sheltered creeks. Unlike open-ocean encounters, the shallow mangrove waterways bring paddlers within 10 to 15 metres of feeding pods, close enough to hear exhalations through blowholes and watch mothers nudging calves toward the surface. The sanctuary's mangrove corridors span 600 hectares of intertidal flats, their pneumatophore roots creating lattice barriers that trap sediment and filter Port River runoff. Commercial shipping ceased in the western channels during the 1980s, allowing Avicennia marina stands to reclaim derelict pilings and abandoned jetties. Today these waterways serve as nursery grounds for yellowfin whiting and blue swimmer crabs, which in turn sustain the dolphin population and attract over 50 migratory bird species during spring months. Port Adelaide kayaking routes wind between Garden Island and North Arm, threading narrow creeks where mangrove canopies overhang paddlers and white-faced herons stalk mudflats at low tide. Morning light transforms the sanctuary into a study in contrasts: industrial grain silos rise beyond the mangrove fringe while egrets lift from tidal pools in silent formation. The ecological recovery remains incomplete—stormwater outfalls still discharge into western channels, and dolphin scarring from boat propellers persists in high-traffic zones—but the sanctuary demonstrates how protected urban estuaries can support apex marine mammals within sight of container terminals. Adelaide dolphin sanctuary mangroves kayaking tour routes follow tidal cycles, launching two hours either side of high water when channels flood to navigable depth and dolphins move inshore to hunt. Guides track pod movements via surface disturbances and directional hydrophones, repositioning groups to intercept feeding runs without crowding the animals. Twilight paddles extend into dusk, when the mangrove understory darkens and dolphin activity peaks during the evening hunt. Bioluminescent plankton ignites in paddle wakes under moonless skies, tracing dolphin movements as blue-green phosphorescence. The sanctuary remains open year-round without entrance fees, its waterways accessible to paddlers who respect no-approach zones and maintain 50-metre separation from dolphin pods.