Gluggafoss - Window Falls
by Evdokia Tapoglou, Technical University of Crete, Chania, Greece
The upper half of the cliff is palagonite and tuff rock, while the lower ledge is basaltic rock. River Merkja overtime formed tunnels and windows through the soft rock, forming an arch under which the river flows.
Evdokia Tapoglou (distributed via imaggeo.egu.eu)