The nature reserve category means a strictly protected natural area, serving the effective protection of ecosystems and natural processes, where all economic activities are prohibited and access is restricted solely to scientists and rangers (depending on the country - in some cases, low-impact tourist visitation may be allowed). The protective status of nature reserve is legally granted with no time limitation, and its withdraw'al, theoretically possible, is usually subject to complicated procedures, in the event that the natural values have seriously deteriorated or vanished. Thus, nature reserves have much higher legal protective status.