Los Penitentes - With Full Moon - Argentina. Penitentes, are a snow formation found at high altitudes. They take the form of tall thin blades of hardened snow or ice, closely spaced with the blades oriented towards the general direction of the sun.
Beautiful stripes in the landscape of the Quebrada de Humahuaca, a narrow mountain valley located in the province of Jujuy in northwest Argentina, miles north of Buenos Aires. It is about 96 miles long. - photo from Geology IN