Langjökull is the second largest ice cap in Iceland, after Vatnajökull. Into the Glacier offers various tours into the man-made Ice Caves in Langjökull. Langjökull (Icelandic for "long glacier") is the second largest ice cap in Iceland ( 953 km2), after Vatnajökull. The view from the top of Langjökull glacier. Langjökull is the second largest glacier in Iceland located in the Western Highlands visible.