Place + 上空
The noun 上空 (shàngkōng) means "the sky above" or "overhead," referring to the airspace directly over a location. It is typically used after a place noun. For example, 海洋上空 means "above the ocean" or "in the skies over the sea."
一架飞机从城市上空飞过。
Yī jià fēijī cóng chéngshì shàngkōng fēi guò.
An airplane flew over the city.
乌云笼罩在小镇上空,看起来要下雨了。
Wūyún lǒngzhào zài xiǎo zhèn shàngkōng, kàn qǐlái yào xià yǔ le.
Dark clouds hung over the small town; it looked like it was going to rain.
夜晚的湖面上空挂满了星星。
Yèwǎn de hú miàn shàngkōng guà mǎn le xīngxing.
The night sky above the lake was filled with stars.