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Definition of Open water
1. Noun. An expanse of an ocean, sea, or large lake which is distant from shore and devoid of nearby islands or other obstructions. ¹
2. Noun. In a river, pond, or other small body of water, an area of surface unobstructed by aquatic vegetation, boulders, and the like, adequate for navigation or swimming. ¹
3. Noun. (chiefly Canada) An area of an ocean, sea, lake, or river which is not covered by ice. ¹
¹ Source: wiktionary.com