Author Scott Sadil sailed last week into Puerto Adolfo López Mateos, Baja California Sur, completing the final leg of a 300-mile circumnavigation of Isla Magdalena in his home-built double-ended beach yawl, Madrina.

“We had the typical 20-plus knot afternoon winds blowing in off the Pacific,” said Sadil, who undertook the voyage to help raise awareness of one of the world’s last undeveloped estuarine habitats. “With a single reef in her mainsail, Madrina galloped up the bay like a horse heading for the barn.”