Thingvellir Cottage is about 30-40 min. drive from Reykjavik. Also near Geysir and Strokkur hot springs, Gullfoss, Kerid and Laugarvatn.
Thingvellir Cottage is right on the lake with great visibility over lake Thingvallavatn and nearby mountains.
Lake Thingvellir (known as Þingvallavatn in Icelandic) is 114 meters deep and with a surface of 84 km² it is the largest natural lake in Iceland