"Declivity" is a word in ENGLISH

declivity ENGLISH
Definition:

A descending surface; a sloping place.

declivity ENGLISH
Definition:

Deviation from a horizontal line; gradual descent of
surface; inclination downward; slope; -- opposed to acclivity, or
ascent; the same slope, considered as descending, being a declivity,
which, considered as ascending, is an acclivity.

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descent ENGLISH

Inclination downward; a descending way; inclined or sloping surface; declivity; slope; as, a steep descent.

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level ENGLISH

An approximately horizontal line or surface at a certain degree of altitude, or distance from the center of the earth; …

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profound ENGLISH

Descending far below the surface; opening or reaching to a great depth; deep.

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