huán
large domain
extensive region
人寰
rén huán
world
寰宇
huán yǔ
the whole earth
寰球
huán qiú
(literary) the globe; the entire world
寰螽
huán zhōng
eastern shield-backed katydid (genus Atlanticus)
惨绝人寰
cǎn jué rén huán
extremely tragic (idiom); with unprecedented brutality
撒手人寰
sā shǒu rén huán
to leave one's mortal frame (idiom)