| 1916 |
Natuurmonumenten buys the rights from the State for the grass crop on Griend |
| 1924 |
State nature reserves Noordsvaarder and Boschplaat on Terschelling are established (4900 ha); the Koegelwieck (250 ha) also becomes a nature monument |
| 1926 |
State nature reserves the Muy, Slufter, Geul and Mok Bay on Texel are established (2400 ha) |
| 1935 |
The State gives the Beer Foundation the nature reserve De Beer to manage (1300 ha) |
| 1936 |
Natuurmonumenten leases the Schorren on Texel from the Water Board (1200 ha) |
| 1938 |
The State gives lt Fryske Gea the Bildtpollen to manage (2300 ha) |
| 1938 |
Idem Oerd on Ameland (225 ha) |
| 1939 |
The State gives the Zeeuwse Landschap the Zwin to manage (33 ha) |
| 1939 |
The Zeeuwse Landschap leases the hunting rights in the Noordsloe from the State (1400 ha) |
| 1957 |
Gors by the Punt, Goeree, State nature reserve in the name of Crown Lands (10 ha) |
| 1957 |
OUter dike by Oostdongeradeel managed by lt Fryske Gea (320 ha) |
| 1960 |
The State gives the Zeeuwse Landschap part of the Sunken Zwarte Polder to manage and purchases other parts from private owners (69 ha) |
| 1961 |
The Beer Foundation leases Scheelhoek, Kwade Hoek, Punt Goeree, Hompelvoet and Katse Plaat from the State (1315 ha) |
| 1961 |
The Beer Foundation leases hunting rights of the Ventjagersplaten from the State (2000 ha) |
| 1961 |
State nature reserve Seal Reserve Schiermonnikoog |
| 1961 |
State nature reserve Seal Reserve Eierlandse Gat (20.000 ha) |
| 1961 |
State nature reserve Kobbeduinen, Schiermonnikoog (2400 ha) |
| 1961 |
Dutch Bird Society leases Schonen Balgzand (70 ha) |
| 1963 |
State nature reserve Verdronken Land van Saeftinghe (2850 ha) |
| 1971 |
Verdronken Land van Saeftinghe (2850 ha) wordt Staatsnatuurreservaat |
| 1974 |
Boschplaat, Terschelling, falls under the Nature Protection Act (4400 ha) |
| 1976 |
The Zeeuwse Landschap purchases part of the Krabbekreek (160 ha) |
| |
Verdronken Land van Saeftinghe falls under the Nature Protection Act and is managed by The Zeeuwse Landschap |
| 1977 |
Dollard falls under the Nature Protection Act (4320 ha) |
| 1978 |
Management of the Hooge Platen, Westerschelde is given to the Zeeuwse Landschap (860 ha) |
| 1981 |
Natuurmonumenten and the Groninger Landschap purchase the Dollard (4200 ha) |
| 1981 |
Large part of the Wadden Sea falls under the Nature Protection Act (110.000 ha) |
| 1990 |
Oosterschelde falls under the Nature Protection Act (22.240 ha) |
| 1993 |
The rest of the Wadden Sea falls under the Nature Protection Act (150.000 ha) |
| |
| From: Wolff (1996); Natuur in het water: van exploitatie naar bescherming |
