What topographical feature is located at grid coordinate 698012?

Answer 1

Impossible to answer without the map which you very likely do have.

The coordinate 698012 describes one particular box on the grid on your map. The first part of the coordinates usually describes the vertical row while the second relates to the horizontal rows. So see if you can locate a vertical row numbered 698. Once you've found it, then located the horizontal row 012. Where both rows coincide is where grid 698012 is.