"Western volcanic zone includes the Reykjanes peninsula and the Langjökull Glacier, created as the land moved over a localized hotspot, but it is the one that has the most visually recognizable caldera still intact as per the available information. The caldera, like the other volcanic rock in the area, is composed of a red (rather than black) volcanic rock." ( Wiki )
How it formed: When a volcano has erupted enough of magma and emptied inside, it can't hold the mountain anymore and collapse to form a circular space on earth.
How to Reach: We reached the place in the morning. Our #Golden circle trip included the entry pass for us and children below 12 years are free. It took us approx an hour to reach from #Reykjavik. It is located on Iceland's popular Ring Road. A drive of 30-40 mins through Ring Road 1 and 10-15 mins through Ring road 35 will get you there.
Entering to the site we were greeted with red volcanic soil and aqua blue water. Heard that the water in caldera freezes to ice during winter and shows up with complete different view altogether.
Either you choose to ascend following a trail or descend hiking steps. We choose to descend to touch the water.