Dead Sea on the Israeli side allows production of magnesium metal (by a subsidiary, Dead Sea Magnesium Ltd.). Due to the popularity of the sea's therapeutic and healing properties, several companies have also shown interest in the manufacturing and supplying of Dead Sea salts as raw materials for body and skin care products. Since 1930, when its surface was and its level was below sea level, the Dead Sea has been monitored continuously. In recent decades, the Dead Sea has been rapidly shrinking because of diversion of incoming water from the Jordan River to the north. The southern end is fed by
Kettle River (St. Croix River) but not intensity as the river approaches the St. Croix. This last section of the river is some of the best canoeing available in the state with manageable rapids, good fishing, frequent wildlife sightings (including bears) and absence of other people. The Kettle River hosts class III-IV white water rapids that are frequently paddled by kayakers, canoeist, and rafters. The Kettle flows into the St. Croix River east-northeast of Pine City. Near its headwaters the river collects the West Branch Kettle River, which flows southeastwardly from its source near Wright. Other tributaries include the Dead Moose and Split Rock rivers,