Near the highway road 427 from Grindavík
427
-1,

Stóra og Litla Eldborg are two protected craters.

They are  part of a lava-ring type. The age is not well known, but judging from the soil cover, gravel deposits covering it and the effecs of weathering on its surface, it might be 7000-8000 years old.  

Location: Near Grindavík above road 427 is Stóra Eldborg and below the road is Litla Eldborg.