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The Golfo Dulce, a large gulf on the southern Pacific coast of Costa Rica, is termed a "tropical fjord" because it has a deep basin (215 meters) the depths of which are very low in oxygen. The ecosystem of the Golfo Dulce functions very differently from that of most other tropical gulfs. The Golfo Dulce is the only tropical fjord on the Pacific coast of the Americas. In the entire world only five are known.
