Faxi
Gluggafoss, also known as Merkjárfoss, is a striking waterfall in Fljótshlíð, South Iceland. The Merkjá river has carved tunnels and openings through soft palagonite rock, giving the waterfall its name: gluggar means windows. Water, basalt, tuff and a small stone arch combine to make this one of the South Coast’s most distinctive lesser-known stops.
The falls are around 21 kilometres from Hvolsvöllur, reached through an agricultural valley rather than the Ring Road’s busiest corridor. It is an excellent detour for travellers who prefer geological detail and a short walk over a crowded signature sight.
Quick guide to Gluggafoss
| Location | Fljótshlíð, South Iceland, off road 261 |
|---|---|
| River | Merkjá |
| Time to allow | 45–75 minutes |
| Walk | Short natural paths to the falls and viewpoints; ground can be steep or slippery |
| Best season | Late spring to early autumn; visit year-round only when access and footing are safe |
| Best for | Unusual geology, short walks and a quieter South Iceland detour |
| Good to know | The waterfall and surrounding landscape are protected; stay on paths and well back from the river and cliff edges |
Why the waterfall has “windows”
Gluggafoss is unusual because the Merkjá has worked through soft tuff above a harder basalt ledge. Over time this created tunnels and openings through which the water could be seen, like windows in the cliff. The shape has changed in living memory as ash, floods and erosion altered the channels, so the waterfall is also a lesson in how active Icelandic landscapes remain.
A quieter South Iceland detour
The Fljótshlíð setting deserves unrushed driving. Use the designated parking and approach, respect private farmland and do not block gates or narrow roads. Natural paths can be muddy after rain, and the best viewpoints do not require you to approach the brink of the falls.
See the layers, not only the drop
Look for the contrast between the pale tuff and darker basalt as you walk. A longer lens can capture the openings and upper arch from safe ground; a wide lens is useful for the surrounding valley. Keep drones grounded unless current rules and landowner guidance clearly allow them.
Gluggafoss FAQ
Is Gluggafoss the same as Merkjárfoss?
Yes. Gluggafoss is also called Merkjárfoss, after the Merkjá river.
Why is it called Window Falls?
The river carved tunnels and openings in the soft tuff rock, creating the “windows” that inspired the name.
Where is Gluggafoss?
It is in Fljótshlíð in South Iceland, reached from the Hvolsvöllur area via road 261.
How long should I allow?
Allow 45–75 minutes for the walk, viewpoints and a careful look at the geology.
Can I walk to the top?
Use only established paths and viewpoints. Gorge edges and wet tuff can be hazardous.
Is it suitable in winter?
Only when the road, weather and ground conditions are clearly safe. Ice and short daylight add risk.
Are there facilities?
Prepare before leaving Hvolsvöllur or other larger stops; do not rely on facilities at the waterfall.
Can I combine it with the South Coast?
Yes, but treat it as a relaxed valley detour rather than an extra rushed stop on a full Ring Road day.