ธรรมชาติ, การท่องเที่ยว, การสำรวจ, กลางแจ้ง, โรงไฟฟ้าพลังน้ำ, ไฟฟ้าพลังน้ำ, ทางที่แม่น้ำไหลผ่าน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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