This valley cuts into the mountainous region to the east of the icecap Vatnajökull and branches to the south, where it is called the Flugustadir Valley.  Both valleys are mostly uninhabited and partly wooded, especially in Tunga, which is the lowest part of the mountain between them.  River Hofsa runs through the Hof Valley and spills into the Alftafiord Bay.  It discharges Lakes Hofsvotn, just east of glacier Hofsjokull, which supplies the main volume through the Flugustadir Valley.  The glacial part of the river transports great quantities of sand and soil and gradually decreases the bay in size.  Behind the waterfall Storifoss is rather a large cave.  The river was bridged in 1955 and the next year the levee was finished.

The Hofsjokull Glacier (1069m) with an area of about 13 km² is situated between the Vididalur Valley and the Hof Valley.  The glacier snout creeping down into the Vididalur Valley is called Morsarjokull.  In earlier times the shortest route between that valley and the most distant farms in the Hof Valley ran through a pass between the glacier and Mt Tungutindar (1175m).