Geysir is an active geothermal area where the hot spring Geysir is, the most famous hot spring in the world. History of recent centuries shows that earthquakes have tended to revive the activity of Geysir but from year 2000 it has not erupted. When it did erupt, it was sending boiling water up to 70 meters into the air.
Nearby geyser is Strokkur and it´s very active now. It erupts up to 30 metres every few minutes.
Gullfoss is a waterfall and one of the most popular tourist attraction in Iceland.
Gullfoss is in the glacial river Hvítá where you will be able to see the water plummet down into the 32 meter deep crevice. The waterfall is in two stages, 11 meters and 21 meters. The average amount of water in the waterfall is 140 cubic meters (4,900 cu ft) per second in the summer and 80 cubic meters (2,800 cu ft) per second in the winter. The highest flood was measured 2,000 cubic meters (71,000 cu ft) per second.