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An important high temperature geothermal area.

Many study opportunities due to the great variety of features. A boardwalk leads through the area. Seltún has many mudpots and fumaroles, and minerals deposited from geothermal solutions provide colorful sediments. Good walking paths are around the area and parking. 

Setún is a part of Reykjanes nature reserve. 

Location: Road 42, parking, near Kleifarvatn.