The Sea Level of a planet was the average level of its seas and oceans. It was an useful reference point for comparing heights.

After being attacked by a sur-snake on Argo, James T. Kirk and Spock were eventually found on a small island just above sea level. (TAS: "The Ambergris Element")

Enterprise kept it's gravity at Earth sea level, unlike some Earth Cargo Service ships, including the ECS Horizon and ECS Fortunate. (ENT: "Broken Bow", "Fortunate Son")

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• sea level