The noun 沙 (shā) means "sand" and refers to the fine granular material found on beaches, deserts, and riverbeds. It appears in many compound words such as 沙漠 (desert), 沙滩 (sandy beach), and 沙发 (sofa, a loanword). In poetry, it often evokes imagery of vast, desolate landscapes.
孩子们在沙滩上用沙堆了一座城堡。
Háizimen zài shātān shàng yòng shā duī le yī zuò chéngbǎo.
The children built a castle out of sand on the beach.
风一吹,沙就迷了我的眼睛。
Fēng yī chuī, shā jiù mí le wǒ de yǎnjing.
When the wind blew, sand got into my eyes.
这条河的河底都是细细的沙。
Zhè tiáo hé de hédǐ dōu shì xì xì de shā.
The bottom of this river is all fine sand.