text: How far away the horizon is depends on the height your eyes are at.  A taller person will be able to see farther than a short person, and a person at the top of a building or other tall object will be able to see much much farther.\n\nFor a person of average height standing in a featureless field  (i.e. the ocean) the horizon would be about 3 miles away.\n\nThis website: http://www.boatsafe.com/tools/horizon.htm  will give you the distance to the horizon based on your height.