Keyline is a land management technique designed to improve soil health and water retention in agricultural landscapes. It involves creating a series of contour lines or channels that guide water flow, helping to prevent erosion and promote even distribution of moisture across the land. This method enhances the productivity of the soil and supports sustainable farming practices. Developed by P.A. Yeomans in the 1950s, Keyline focuses on the natural topography of the land. By strategically placing vegetation and implementing specific farming practices, it aims to create a balanced ecosystem that benefits both crops and the environment.