ZONEMAPstatement is available starting with Oracle Database 12c Release 1 (188.8.131.52).
ZONEMAP statement to remove an existing zone map from the database.
The zone map must be in your own schema or you must have the
VIEW system privilege. You must also have the privileges to drop the internal table and indexes that the database uses to maintain the zone map data.
Specify the schema containing the zone map. If you omit
schema, then Oracle Database assumes the zone map is in your own schema.
Specify the name of the existing zone map to be dropped.