低平火山口

maar

low / beneath / to lower (one's head) / to let droop / to hang down / to incline

surname Ping

flat / level / equal / to tie (make the same score) / to draw (score) / calm / peaceful / abbr. for 平聲|平声[ping2 sheng1]

fire / urgent / ammunition / fiery or flaming / internal heat (Chinese medicine) / hot (popular) / classifier for military units (old) / Kangxi radical 86

volcano

mountain / hill / anything that resembles a mountain / CL:座[zuo4] / bundled straw in which silkworms spin cocoons / gable

volcanic crater

Yamaguchi (Japanese surname and place name) / Yamaguchi prefecture in southwest of Japan's main island Honshū 本州[Ben3 zhou1]

mountain pass

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls