Slope less than 3 degrees and not a hilltop, ridge, valley bottom or depression. A flat flat A depression located along the axial trend of an anticline; an area confined on two sides by downward slopes and on two sides by upward slopes. A saddle saddle None of the codes in the table are applicable in the context of this particular station/platform. inapplicable inapplicable Higher than all or nearly all of the surrounding land, but elongated and extending beyond a 50 m radius. A ridge ridge Unknown local topography unknown unknown 3 Lower than nearly all of surrounding land beyond a 50 m radius, but water can flow out. A valley bottom valleyBottom 2019-11-21T09:04:45.487Z Local topography Higher than all or nearly all of the surrounding land beyond a 50 m radius. A hilltop hilltop Local topography Neither crest nor depression or valley bottom, and with slope more than 3 degrees. A slope slope Lower than surrounding land beyond a 50 m radius, with no surface outlet for water. A depression depression