Rossum is a village in the Dutch province of Gelderland. It is a part of the municipality of Maasdriel, and lies about 11 km southwest of Tiel. Ro…Rossum is a village in the Dutch province of Gelderland. It is a part of the municipality of Maasdriel, and lies about 11 km southwest of Tiel. Rossum was a separate municipality between 1818 and 1999, when it was merged with Maasdriel.