Potential answers for "Natural barrier"

⭐⭐⭐⭐ REEF
⭐⭐⭐⭐ HEDGE
⭐⭐⭐ ALPS
⭐⭐ ODOR
⭐⭐ SALTDOME
⭐ SPAS
⭐ ESHARP
⭐ PEATBOG
⭐ SST
⭐ DYES

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