The Limantour Spit is a world of its own, isolated, windswept and surrounded by the sea. In a park filled with natural wonders, the sandspit stands out as exceptionally wild and primal, backed by broad estuaries, white cliffs and rolling headlands exposed to the raw forces of nature. 

The spit breaks away from the mainland at the trailhead where the big steel bridge crosses the tidal channel. For a few decades, the marsh just…