DUNDERLANDSDAL  , a valley of

northern Norway, in Nord-land amt (county), draining south-westward from the neighbouring glaciers to the Ranenfjord (lat . 66° 2o' N.) . There are deposits of iron ore, the working of which was undertaken in 1902 by the Dunderland Iron Ore Company, water-power being provided by the strong Dunderland river . There are also pyrites mines . At the mouth of the river is Mo, a considerable trading village . The valley is remarkable for several stalactite caverns in the limestone, some of the tributary streams flowing for considerable distances underground . From Mo a fine road crosses the mountains to the head-lake of the great Ume river, draining to the Baltic, and from the head of Dunderlandsdal a sequestered bridle-path runs to Saltdal on the Skjerstadfjord, with a branch through the magnificent Junkersdal .