산지에서 바다로 흐르는 유역 일러스트

A vast watershed basin seen from high elevation, rolling hills dividing drainage areas, streams converging into a central river, patchwork landscape., Modern flat editorial illustration, implied soft directional light, no heavy shadows, contemporary, sophisticated, clean mood, limited 3-4 color palette with one accent, muted tones, rule of thirds, deliberate negative space, No text, no watermark.