KanjiJLPT N1
Cape

cape, spit, promontory

Mnemonic

A strange column of earth pushes out into the ocean, forming a narrow cape. The earth here grew in such a strange direction that sailors swear the cape is alive, reaching its rocky fingers toward the horizon like a land creature desperate to escape the shore.
Additional thoughts
Picture the earth itself behaving strangely—growing sideways into the sea instead of staying put. That unnatural extension is what makes a cape. Think of Saitama prefecture, whose name literally uses this kanji.
Quick recall
Strange earth juts into the sea, forming a cape.

Details

The keyword for 埼 is cape. This kanji refers to a geographical cape or promontory—a narrow point of land that juts out into a body of water. It is most commonly encountered in the place name Saitama (埼玉), a prefecture in Japan. The character conveys the idea of land extending outward, forming a peninsular or cape-like shape along a coastline.
On'yomi
Kun'yomi
さき、さい、みさき