abstract:Rille (German for 'groove') is typically used to describe any of the long, narrow depressions in the lunar surface that resemble channels. Typically a rille can be up to several kilometers wide and hundreds of kilometers in length.
They landed at Hadley Rille near the Apennine Mountains, northwest of the place where Apollo Eleven had landed.
VOA: special.2009.07.29
But in one, a formation known as Cobrahead, on the Aristarchus Plateau at the edge of the Ocean of Storms, Clementine's cameras saw a definite reddening of a sinuous feature called a rille.