open water
Noun
Meaning
An expanse of an ocean, sea, or large lake which is distant from shore and devoid of nearby islands or other obstructions.
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.
(chiefly Canada) An area of an ocean, sea, lake, or river which is not covered by ice.
Source: en.wiktionary.orgSynonyms
Examples
By its second summer, Open Water Charters was already turning a profit.