Henneth Annûn, also called the Window of the Sunset, or Window on the West, was a hidden refuge of the Rangers of Ithilien in the northern part of Ithilien along the Ephel Duath, the Mountains of Shadow. The waterfall cascading over the cliff-face had originally run through the cave itself, but was altered to flow over one of the entrances; this likeness to a window gave Henneth Annûn its name. There are two entrances into the cave system- one being the route through which Samwise Gamgee and Frodo were led, and the other being the window itself. At the bottom of the window was a bowl full of sharp stone knives.