Bleau is a very popular bouldering area. The problems are organized into circuits and each circuit is color coded for their degree of difficulty. The color/difficulty codes are White/children (pour les enfants), Yellow/easy to a bit difficult, Orange/some difficulties, Green/some difficulties, Blue/Difficult, Red/very difficult, Black/extreme difficulties. School children are often bussed here to frolic amongst Bleau's many boulders. The area is expansive and lies in the forest outside the town of the same name. There are about 15 different sub-areas most with many of other own other sub-areas. Many of the larger areas have as many as 5 circuits within them. That's a whole lotta bouldering, folks.