According to the IDA definition, an International Dark Sky Reserve is an extensive public or private space that enjoys a night sky of exceptional quality. Also, this dark sky must be protected for scientific, educational or cultural purposes or as a nature reserve. A Reserve comprises both a central zone where natural darkness is totally preserved and a peripheral region where public representatives, businesses and individuals recognize the importance of a dark sky and commit to long-term protection. The IDA has also defined Dark Sky Communities and Parks