เขื่อน, ธรรมชาติ, ภูมิประเทศ, น้ำ, ไหล, น้ำไหล, การอนุรักษ์น้ำ, ถนนลูกรัง, ชนบท
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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