This dramatic turn-around is considered to be the result of the Miracle on the Han River, a term coined to describe Seoul's highly accelerated and successful development since the early 1960s. Used charcoal briquettes and other industrial waste materials produced during the city's rapid development in this period led to pile ups of trash. By the 1990s, these pile ups grew to mountains at a height of 95 meters and length of 2 kilometers, even after being compressed into a rectangular shape that weighed over 120 million tons. This was in comparison to the Namsan mountain in Seoul, which is 262 meters. Nanjido's accumulation of garbage increased to 3,000 truck loads of waste per day, essentially creating a pyramid 34 times larger than The Great Pyramid of Giza in Egypt.