The Dead Sea is the lowest place on Earth, but is it the closest place on the surface to the planet's center? If not, what is?

The lowest point on land on earth is at the Dead Sea, on the border of Jordan and Israel. The Dead Sea lies at 1,312 feet (400 meters) below sea level.
The lowest point in the sea on earth is the Pacific Ocean's Marianas Trench. It's near Guam and is 35,840 feet (10,924 m) deep.
http://geography.about.com/library/faq/blqzlowestpoint.htm

The Marianis Trench IS on the Earths surface. It just happens to be covered by 7 miles of water.


In another train of thought:


Radius:
Equatorial 6,378.135 km
Polar 6,356.750 km
Mean 6,372.795 km

There is a 22 Kilometer difference between the distance from the Earths surface to the core at the Poles compared to the Equator. One would have to calculate the position of the dead sea along the elipse of the Earths surface to determine the radius and compare it to the radius at the poles. I believe that a point at the South Pole (south because it is an actual land mass)is considerably closer to the core than the Dead Sea. The further one travels from the South Pole, the greater the radial distance from the core and the Dead Sea is not 22+ Kilometers deep.

Deepest point in the sea: Challenger Deep, Pacific, 11,032 m.

Equatorial diameter: 12,756 km

Polar diameter: 12,714 km

Lowest point on land: Dead sea shore, Israel, 395m below sea level.

Tallest mountain: Mauna Kea, Hawaii, 10,203 m from submarine base to peak.

Polar radius: b

The Earth's polar radius, or semi-minor axis, is the distance from its center to the North and South Poles, and equals 6,356.750 km (?3,949.901 mi; ?3,432.370 nmi).

Equatorial radius: a

The Earth's equatorial radius, or semi-major axis, is the distance from its centre to the equator and equals
6,378.135 km (?3,963.189 mi; ?3,443.917 nmi).

https://en.wikipedia.org/wiki/Earth_radius

So the closest spot to the core would actually be the North Pole, which is pretty much at sea level, whereas the South Pole is at an altitude of some 200 feet above sea level.