💦 🏞️ Gluggafoss waterfall (Window Falls) is a magnificent 44 meters high waterfall in Fljótshlíð in South Iceland. It is a series of waterfalls running in the small river Merkjá and together these waterfalls are called Merkjárfoss Falls. What makes Gluggafoss unique is its geology – the river has created several holes and tunnels in the soft palagonite bedrock, through which the water finds its way. Gluggafoss is a very scenic waterfall. Seeing that the upper level of the waterfall cascades through soft palagonite the waterfall has changed through the years.