ทะเลสาป, หอสังเกตการณ์, การขุดหลุมแบบเปิด, การบุกเบิก, รูที่เหลือ, น้ำ, ธรรมชาติ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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