The Greenland Ranch Open Space system is a huge collection of properties along the I-25 corridor between Castle Rock and Colorado Springs. Basically, it will provide a natural area surrounding the Interstate from Larkspur to Monument Hill. The Douglas County portion is about 21,000 acres on both sides of the highway and is made up of about a half dozen parcels pieced together. An additional 1,000 acres in a subdivision just west of I-25 will protect the viewshed to the top of the hill visible from the highway. To the east of I-25 near the rest area, The Nature Conservancy has a property with one of the largest elk herd in the region. The Douglas County park portion cost about 20 million dollars in a split between county and GOCO (Colorado Lottery) funds. Preserving this area means that there will always remain a portion of the frontrange grasslands between Colorado Springs and Denver.