Bláhnúkur is one of the prominent mountains close to Landmannalaugar and therefore a possible half day tour destination from there.
How to find Bláhnjúkur:
Bláhnúkur is just about (less than) an hour to go from Landmannalaugar.
GPS coordinates of Bláhnjúkur: 63.984767, -19.059144 Take me there!