Sentiero 4 Luglio SkyMarathon is a skyrunning event created in 1994 at Santicolo di Corteno Golgi.
Three times trial world championship (2003, 2004, 2007), for a few years (1999, 2011, 2012 and 2013) was organized in collaboration with Aprica (SO); from 2014 is again organized only by Corteno Golgi (BS). It consists of two distances: classical Marathon and half marathon (this last, since 2000). Main source: web site http://www.maratonadelcielo.it.
References
Sentiero 4 Luglio SkyMarathon Wikipedia(Text) CC BY-SA