What does this number measure?
An immense subduction zone in the western Pacific. The Mariana Trench includes Challenger Deep, one of the deepest known regions of the ocean. Depths vary with location and measurement campaign; the reference value is rounded.
Compare the stated dimensions
The comparison uses the number in each fact sheet: altitude, height, diameter, length or distance, depending on the reference. Two values in metres do not necessarily describe the same property.
Source and limitations
Catalogue order of magnitude; a source is provided, but this measurement has not been individually audited.
Interpreted bathymetric and tectonic cross-section, with simplified proportions and subsurface included. The roughly 10 900 m refers to depth below the surface, not the drawing's entire height.