Rumst (Dutch pronunciation: [rɵmst], old spelling: Rumpst) is a municipality located in the Belgian province of Antwerp. Since 1976 the municipality not only comprises Rumst proper but also the towns of Reet (old spelling: Reeth) and Terhagen, which were independent municipalities before that year. Industry in Rumst, like Boom, was heavily focused around the production of clay products like bricks. This industry has largely disappeared after 1970. In Rumst, the river Rupel starts as a combination of the Dijle and Nete (river) rivers.