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The Great Wall of China is considered the longest man-made structure in the world, stretching over approximately 13,171 miles (21,196 kilometers). It was originally built to protect various Chinese dynasties from invasions by nomadic tribes.
These are my following choices,Nile RiverThe Great Wall of ChinaRussian boarderLake VictoriaI think placed in order isNile RiverRussian boarderGreat Wall of ChinaLake Victoria
Canada has the longest coastline in the world, with a coastline stretching over 202,080 kilometers (125,570 miles).
Ramanathaswamy
Yes, the Ob River in Russia is the 7th longest river in the world, not the 5th. It is approximately 2,268 miles (3,650 km) long.