Category:Reef knolls

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<nowiki>Bioherm; Bioherma; Біогерми; Biogerm; Биогерм; Bioherm; Reef knoll; جزيرة الشعاب المرجانية; Биогерм; landform of calcareous material accumulated on an ancient seabed.</nowiki>
Reef knoll 
landform of calcareous material accumulated on an ancient seabed.
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