ไฟฟ้าพลังน้ำ, โรงไฟฟ้าพลังน้ำ, น้ำ, ธรรมชาติ, ภูมิประเทศ, ขาวดำ, การเปิดรับแสงนาน, ต้นไม้, ป่า, ที่ไหล, ดำและขาว
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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