There are no speed limits, no age limits and no roads across these sands.

Formed by ancient Colorado River delta sediments fanned out across the desert floor, the area is also known as Glamis, after the nearby town, or the Algodones Dunes. The 200 square miles of wind-sculpted ridges, bowls and flatlands undulate from the Chocolate Mountains south to the Mexican border.

They are among the most popular — and most deadly — places in the nation for riding off-road vehicles, particularly on holiday weekends in winter. Seven have died so far this riding season, which runs from October through April. It is the highest toll at this point in the season in the memory of coroner's officials here.

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