HSK C3/W3/V6
Correct

界

/ jiè / 
Strokes

Definition

boundary/scope/extent/circles/group/kingdom (taxonomy)

Example

As a Noun
boundary; border
1
Yǐ
以
mǒu
某
wù
物
wéi
为
jiè
界

be fringed by/with sth

2
Lì
立
zhuāng
桩
wéi
为
dìchǎn
地产
dìngjiè
定界

define property with stakes

3
Shěngjiè
省界

provincial boundaries

As a Noun
scope; extent
As a Noun
circles
As a Noun
primary division; kingdom
As a Noun
erathem
As a Verb
border on