Hoskuldarvellir is a green spot in the lava field to the west of the shield volcano Trolladyngja on the Reykjanes Peninsula in Southwest Iceland.  A stream bead there seems to suggest some kind of a discharge of water from the volcano Trolladyngja.  When it is active during the melting season of snow or discharge of ground water it runs down the plains and continues to recreate the landscape.  Hoskuldarvellir is the largest green area of  the former district Gullbringusysla.