It is sometimes marked by a line of debris, e.g. seagrass, pieces of wood.

UNESCO: L O S S A R Y

Network Rail said once engineers had removed the mud, rubble and debris and made the line safe, trains would resume at a reduced speed.

BBC: Abseilers inspect Devon railway line landslip

Between 700, 000 and 1 million seabirds are killed each year by marine debris such as discarded fishing line and plastic bags.

CNN: The stark reality of a throw-away society

One can imagine how 40 tons of neighboring debris might impact his bottom line and hinder other potential business investment in the area.

FORBES: City Considers Legal Action Against Businessman Who Spent $20,000 To Clean Up 40 Tons Of Trash From Vacant Lot

Track conditions deteriorated during the course of qualifying and the surface was breaking up at the newly resurfaced hairpin with officials forced to use brooms to clear the racing line of gritty debris.

CNN: Hamilton claims pole for Canadian Grand Prix

Carl Edwards' car sailed upside-down into the front-stretch fence on a furious dash to the finish line, showering the stands with debris.

NPR: Horrifying Crash At Daytona Exposes Risks To Fans