The Bay of Fundy, on Canada’s east coast, is home to the world’s highest tides. In a single day, more water funnels through the bay than the combined discharge of all freshwater rivers on earth. The Bay of Fundy’s surging waters and the mudflats below it, sustain an abundance of creatures, including hundreds of thousands of seabirds, the world’s fastest predator and a complex web of invertebrates. Its shores are the only stop for some shorebirds, like semipalmated sandpipers, who migrate south for the winter. It is a bay ruled by powerful currents that unearth 300-million- year-old mysteries and continue to govern communities that live in sync with the rhythm of its restless tides.