谷
コク, たに, きわ.まる, がい, がえ, がや, せ, たり, たん, や
valley
JLPT2 G2 S7 F508
As per 口# (cavity) + 八 split right and left (doubled) → a circular cavity in the earth from which water spouts → *sunken fountainhead*; *valley*; *ravine*; *canyon* (← sunken spot).
[Full Kanji Etymology List]