How does the pharse " best of both worls" relate to an estuary?

Question

environmental science

Answer 1

Estuaries are ecosystems where both fresh and salt water mix.  Think of an inland bay, where fresh water rivers flow into the bay from inner interior areas.  Also, you get salt water from a tidal river and fluctuations in the tide.  The best of both worlds refers to the presence of both fresh and salt water in estuaries.