Correction Appended

VISTA, Calif. — The largest skateboard ramp in the world can be found on a 12-acre farm north of San Diego among the green foothills of the San Marcos Mountains.

Pilots routinely adjust their flight paths for a closer look, which is as good a way as any to sum up the scale of the Mega Ramp. The wooden structure is longer than a football field, as tall as an eight-story building, with a creek bed running through a 70-foot breach.

On a recent sunny afternoon, the ramp’s owner, Bob Burnquist, a renowned 30-year-old professional skateboarder from Brazil, peered over the side to treetops below and said: “I’m not afraid of falling. I’m afraid I might jump.”

That mind-set helps on the Mega Ramp, where skaters reach speeds of up to 55 miles an hour and soar like stuntmen.