คลื่นน้ำ, แอฟริกา, ยุโรป, เอเชีย, ทวีป, นโยบายสิ่งแวดล้อม, กระจาย, สร้างผลกระทบ, โลก
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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