This is the literal translation. I think in the case of either of the options you suggest part of the meaning would be lost.

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Note added at 13 mins (2008-06-23 12:17:28 GMT)
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[PDF] REPORT ABOUT THE LAKE OHRID WATERSHED REGIONFile Format: PDF/Adobe Acrobat - View as HTML
In 1980, UNESCO declared the Macedonian side of Lake Ohrid as a “site of cultural and ...... This was the first protected natural space in Macedonia. ...
portal.unesco.org/.../ohrid%2Bprespa%2Breport%2Baugust%2B2004.pdf -


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Note added at 14 mins (2008-06-23 12:18:32 GMT)
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These UNESCO sites use "protected natural space":

[PDF] REPORT ABOUT THE LAKE OHRID WATERSHED REGIONFile Format: PDF/Adobe Acrobat - View as HTML
This was the first protected natural space in Macedonia. Description and Physical features. Pelister is distinguished among other mountains as one of the ...
portal.unesco.org/.../ohrid%2Bprespa%2Breport%2Baugust%2B2004.pdf - Similar pages - Note this

[PDF] Environment and Sustainable DevelopmentFile Format: PDF/Adobe Acrobat - View as HTML
insular territory is protected natural space) with a high population rate which has been. possible, among other reasons, because of the historical reasons ...
www.unesco.org/mab/doc/CompiledIJESD2008.pdf - Similar pages - Note this

[PDF] Seville +5; International Meeting of Experts on the Implementation ...File Format: PDF/Adobe Acrobat
another kind of protected natural space, but that they. correspond to a much broader and ambitious concept:. in sum, that of serving as models of approaches ...
unesdoc.unesco.org/images/0012/001236/123605m.pdf - Similar pages - Note this


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Note added at 15 mins (2008-06-23 12:19:22 GMT)
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TLC The Land Conservancy :: Protecting Our Natural and Cultural ...The following organizations have endorsed and will be contributing to the purchase of Thwaytes Landing as a protected natural space and recreation area: ...
www.conservancy.bc.ca/content.asp?sectionid=28 - 30k - Cached - Similar pages - Note this


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Note added at 19 mins (2008-06-23 12:23:08 GMT)
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Perhaps it would be better to substitute "area" for "space":

http://www.google.com/search?hl=en&q="protected natural area...

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Note added at 33 mins (2008-06-23 12:37:32 GMT)
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More referencs for "protected natural AREA" (EU):

http://www.google.com/search?hl=en&q="protected natural area...