บึง, อ่าว, เนื้อไม้, โรคริดสีดวงทวาร, พื้นที่ชุ่มน้ำ, ปากน้ำ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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