1940s
1950s
1960s
1970s
1980s
1990s
2000s
2010s
2020s
2030s
2040s

15th
16th
17th
18th
19th
20th
21st
22nd
23rd
24th
25th

Categories

Categories:

Protected areas established in the 20th century
1990s establishments
1990s in the environment
Protected areas by decade of establishment