Below are possible answers for the crossword clue Natural barrier.
5 letter answer(s) to natural barrier
HEDGE
a fence formed by a row of closely planted shrubs or bushes
an intentionally noncommittal or ambiguous statement; "when you say `maybe' you are just hedging"
any technique designed to reduce or eliminate financial risk; for example, taking two positions that will offset each other if prices change
avoid or try to avoid fulfilling, answering, or performing (duties, questions, or issues); "He dodged the issue"; "she skirted the problem"; "They tend to evade their responsibilities"; "he evaded the questions skillfully"
enclose or bound in with or as it with a hedge or hedges; "hedge the property"
hinder or restrict with or as if with a hedge; "The animals were hedged in"
minimize loss or risk; "diversify your financial portfolio to hedge price risks"; "hedge your bets"
4 letter answer(s) to natural barrier
REEF
a rocky region in the southern Transvaal in northeastern South Africa; contains rich gold deposits and coal and manganese
a submerged ridge of rock or coral near the surface of the water
lower and bring partially inboard; "reef the sailboat's mast"
one of several strips across a sail that can be taken in or rolled up to lessen the area of the sail that is exposed to the wind
reduce (a sail) by taking in a reef
roll up (a portion of a sail) in order to reduce its area
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