Greyscale Terrain Map Showcasing Height Variations with Plateaus and a Valley

create a greyscale map defining height with plateaus and a valley, Create a greyscale map that represents terrain with various heights, including distinct plateaus and a deep valley. The map should visually articulate the differences in elevation through shadowing and texture. The overall design should maintain a monochromatic color scheme, focusing on white, grey, and black to highlight the features. The peaks should be prominent, while the valley should contrast with a lower elevation. Ensure that the landscape appears three-dimensional, with realistic contours and slopes