Tjarnargígur is the only crater of the Lakagígar crater complex filled with water.
How to find Tjarnargígur:
In the Central highlands, Iceland. There is a parking lot nearby, from there on it takes just 5 minutes to come here. And then you can do a 45 minutes loop around the area.
GPS coordinates of Tjarnargígur: 64.040039, -18.306432 Take me there!