What you want to apply for is geographical indication protection certification. The departments that can apply are the General Administration of Quality Supervision, Inspection and Quarantine or the State Administration for Industry and Commerce. You can consult the quality inspection bureau of your province or the intellectual property department of the industrial and commercial bureau for specific application procedures and required materials. It is best to declare to the Industrial and Commercial Bureau, then the name of your region will become the trademark of the local medicinal materials.