“spring (of water)” in Japanese is 泉, read sen, izumi (せん, いずみ). It is a Grade 6 Kyōiku kanji, taught in year 6 of Japanese elementary school, and appears in words such as 温泉 (hot spring).
What does 泉 mean?
山に泉がわく。
Same sound, different character — the classic trap. Compare them side by side: