The San Diego County Board of Supervisors Wednesday unanimously approved land purchases to increase two nature preserves.

The board approved spending $2.8 million to acquire 425 acres for the Mount Olympus County Preserve in Pala-Pauma and Rainbow and $5.3 million for 190 acres to increase Sweetwater Regional Park in Spring Valley.

The addition will expand the Mount Olympus County Preserve to over 1,200 acres and provide large shrubland habitat for deer, mountain lion and other sensitive species, according to Shauni Lyles, a San Diego County communications specialist.