Technically, "sea level" would be zero feet. Sea level is defined as being level with the sea's surface.So let's say men build a sand dune 3 feet high along a beach with the beach being level with the ocean (at zero). That dune would be 3 feet above sea level. Let's say wind piles another 2 feet of sand onto the dunes-- the top would be 5 feet above sea level. Let's say you drive 40 miles inland and you encounter a hill that slopes upward 20 feet before it crests. At the top, you are 20 feet above sea level.The important thing to remember about sea level is it is always about something else in geography. It's about an elevation of land, hill, or mountain. It can be about a river set far inland-- the sea level is based on the elevation of land at the level of the river but as 'sea level'. So the land on which the river sits might be 500 feet above sea level, with higher land surrounding the river.It is NOT about how high the sea level is because sea level is always the surface level. But geographical features can be above--or below--sea level. As another answer states, New Orleans is below sea level in that area. But the mountains in the State of Georgia are higher than sea level-- as is the land between New Orleans and the mountains in Georgia.
Zero feet
The answer to your question is expressed in an equation. If you are 6 feet tall, then that is roughly 2 meters tall. The equation is 3.5 X The square root of 2 meters or however many meters you are above ground. At 2 meters above sea level, You would take the square root of 2 meters which is 1.41 then multiply it by 3.5 which gives you roughly 4.95. That is how many Kilometers you can see. If you want to convert it to feet, multiply it by 1000 to get how many meters which would be about 5000 meters, then multiply it by 2.6 to convert it to feet. That makes it 13000 feet. Then divide by 5280 to get miles. Therefore, at 2 meters above sea level, someone would be able to see 2.5 miles.
mount Kilauea is 1,227 meters above sea level
There are too many to name here but the majour mountain regions on earth are normally above this height.
Chowchilla, California is 240 feet above sea level
Santa Cruz, California is 36 feet above sea level
It is 781 feet above sea level.
Big Bear Lake, California is 6,752 feet (2,058 meters) above sea level
Baltimore is 33 feet above sea level.
It is 2.389 feet above sea level.
The highest point in California is Mt. Whitney at 14,494 feet. Mt. Whitney is the highest mountain in the contiguous 48 states. Mt. McKinley, the highest mountain in Alaska, rises 20,320 feet above sea level and is the highest point in the United States.
It is 295 feet above sea level.
Baltimore is 33 feet above sea level
It is 863 feet above sea level.
617 feet above sea level.
Toronto is 380 feet above sea level.