Theatre The `` Nationaltheater Mannheim '' was founded in NUMBER@1 and is the oldest `` Stage '' in LOCATION@1 .

PERSON@1 and LOCATION@2 together with LOCATION@3 and other cities make a big area called `` Rhine-Neckar-Area '' or `` Rhein-Neckar Triangle '' . Mannheim is the biggest city in `` Rhine-Neckar-Area '' .
