ธรรมชาติ, เส้นทาง, ต้นไม้, ความเป็นป่า, กลางแจ้ง, ป่า, การสำรวจ, ช่วงระยะการเดินทาง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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