stylized terrain island 3d model

3D game environment asset, large modular terrain block, stylized low-poly ground mesh. The center of the map is a vast, completely flat basin covered in a smooth, hand-painted green grass texture. The entire perimeter and outer edges of the map are bordered by high, steep, impassable rocky mountain walls acting as natural world boundaries. Two specific mountain walls feature an empty, dark, hollow cavern indentation representing cave entrances. Zero trees, zero buildings, zero vegetation, clean topology, optimized for a 3D Top-Down isometric camera perspective, game-ready, isolated on white background.