Canyon Og is the northernmost of the streams that flow from the Judean Desert into the Dead Sea. The stream drains the slopes of the Mount of Olives, Mount Scopus and Abu Dis in Jerusalem at 800 m above sea level and descends till the Dead Sea at 400 m below sea level. The steepness of the stream results in heavy flooding during the winter, and in the past, parts of Highway 90 have been swept away. The stream sweeps mud and debris along with the water and sometimes during flooding times it is possible to see a trail of mud, hundreds of meters long, in the waters of the Dead Sea. The stream also passes by Nabi Musa. At the end of the stream, a reservoir was built which stores waters from the floods and is used by Almog.
The name of the stream is derived from the local sumac plant (Rhus tripatita), that grows in the wadi, which is named Ogin Hebrew
(From wikipedia)
The cache is hidden right before the canyon starts (coming from Almog and going west. I have place it over the river bank so hopefully if a flood occurs the cache will not disappear. The easy way to get to it is parking your can near Almog entrance and walking the red path and then the green path, although i recommend to do the round trip starting in the blue path, returning in the green and red path (~ 2-3 hours), it's worth it.
Look at the pics if you have GPS issues
Warning: Do not enter the path if there are flood hazards