Sandvikselva, formerly known as Løxa, is a river in Bærum, Norway, originating at the intersection of the two rivers Lomma and Isielva at Wøyen. The river flows into the Oslo Fjord 4.5 km south at Sandvika, though the center of the city. At the mouth there are three bridges over the river.There were formerly water mills for industry along the line, including at Franzefoss for Franzefoss Bruk. The river regularly floods, and landslides have occurred.