埼
キ, さき, さい, みさき
cape, spit, promontory
JLPT0 G7 S11 F971
As per
奇
# (lean) +
土
earth → *cape* or *promontory* (← headland that leans/edges downwards or into something). Compare
崎
and
碕
.
[Full Kanji Etymology List]