Correct

黑茫茫

/ hēi mángmáng /
Strokes

Example

As an Adjective

pitch-dark all around

1
Zhōuwéi
周围
hēimángmáng
黑茫茫
piān
  
,
zhī
不知
shēn
zài
chù
何处
  

Lost in the boundless darkness, he could not make out where he was.