Worlds largest culvert

The largest culvert in the world is the culvert surrounding the arroyo de monterroso, Rio Monterroso, or river Monterroso. It is located in Estepona Malaga.

Since january 12 1973 it has possessed the record for worlds largest culvert and has never been surpassed. It started being constructed in Jan 12 1973. It is constructed entirely out of concrete and is 1.16 kilometres long, 36 feet wide and 8’6 tall. 480mm (18.9in) Thick concrete walls.