Okker is a term commonly used in the Southern United States to describe dirt that has a reddish or yellowish color. This soil type is found in regions with a high concentration of iron oxide and is often associated with fertile farmland. Synonyms for okker include ochre, rust-colored, reddish-brown, and yellow ochre. The vibrant color of this soil has played an important role in many cultures throughout history, including ancient Egypt and Greece. In addition to its aesthetic value, okker soil is also rich in nutrients and minerals, making it a valuable resource for farmers and gardeners.