What is the measure of water depth that equals 6 feet?

The measure of water depth that equals 6 feet is commonly referred to as a fathom. A fathom is a unit of measurement specifically used in nautical contexts to describe the depth of water. One fathom is equal to 6 feet, making it a straightforward and practical choice when indicating depths in maritime navigation.

Other options do not directly represent the depth of water in the same way. For instance, a meter is a unit of length in the metric system that converts to roughly 3.281 feet, which does not equate to 6 feet. A foot is a standard unit of measurement, but while it can describe depth, it does not specifically correspond to the measure of 6 feet in the same context as fathoms do. Lastly, a league is a larger measurement used historically to describe distance, equivalent to approximately 3 miles rather than depth, and is therefore not applicable for measuring water depth in feet.