囲 surround

I am surrounded by morons.

The well is surrounded by the big box.

atmosphere ★★★★☆
雰 (atmosphere) + 囲 (surround) + 気 (mood) = 雰囲気 (atmosphere)

the atmosphere of a place (usually figurative!)

extent, scope, ★★☆☆☆
範 (standard / the best way to do) + 囲 (surround) = 範囲 (extent, scope,)

the extent, range scope, or bounds (extent of the earthquake-damaged area, scope of the congressional inquiry, range of the birds' migrations).

perimeter ★☆☆☆☆
周 (circumference) + 囲 (surround) = 周囲 (perimeter)

perimeter, circumference