Lands possessing the following characteristics are considered by the legislature to be worthy of consideration for conservation purposes:

(1) Lands identified as having high priority for conservation, natural systems, wildlife, and low-impact public use values;

(2) An area of land or water, or land and water, that has flora, fauna, geological, archaeological, scenic, or similar features of critical importance to the people of Washington and that has retained to some degree or has reestablished its natural character;

(3) Examples of native ecological communities; and

(4) Environmentally significant sites threatened with conversion to incompatible or ecologically irreversible uses.