Augusta Boat Harbour sits at the mouth of the Blackwood River where it meets Flinders Bay, a sheltered anchorage that has served as a refuge for vessels since the 1830s. The harbour's position on the southern tip of Western Australia places it directly along the migration corridor of humpback and southern right whales, which travel between Antarctic feeding grounds and tropical breeding waters twice each year. During peak season—May through early December—up to three thousand humpbacks pass through the bay, often pausing to rest in the calm water within sight of the harbour breakwall. The facility itself was upgraded in 1999 to accommodate both recreational craft and commercial tour vessels. A single concrete ramp descends to a floating pontoon system that adjusts with the tide, and a small fleet of licensed whale-watching operators berths here year-round. The harbour is managed by the Western Australian Department of Transport, which enforces strict approach distances: vessels must remain at least one hundred metres from any whale unless the animal initiates closer contact. These rules, combined with the bay's natural acoustics, mean that augusta boat harbour whale watching tours prioritise passive observation over intrusive pursuit. Flinders Bay's bathymetry—a shallow continental shelf that drops sharply into deep water—creates upwelling currents rich in krill and baitfish, drawing whales close to shore. Southern right whales, identifiable by their callosities and lack of dorsal fin, favour the bay's eastern edge for calving, while humpbacks breach and tail-slap in open water. The harbour's location also offers sightings of orcas, which hunt seal colonies on nearby rocky outcrops, and occasional blue whales during late spring. Augusta boat harbour whale watching departs twice daily during the migration window, with morning cruises leaving between nine and ten and afternoon trips departing after one. The harbour's compact layout means boarding is efficient: most operators load passengers directly from the pontoon within ten minutes of the scheduled departure. Vessels range from rigid inflatables to larger catamarans, each carrying hydrophones that broadcast whale song through onboard speakers. The proximity to Cape Leeuwin—where the Indian and Southern Oceans meet—adds dramatic coastal scenery to every trip, with the 1895 lighthouse visible on the western headland.