島 means island and is a JLPT N2 kanji. It has 10 strokes and uses the mountain radical (山).
Stroke order · 10 strokes
On'yomi (音読み)
トウ
Kun'yomi (訓読み)
しま
Radical
山 · mountain
Strokes
10
How to remember 島
A bird (part of 鳥) perched on a mountain (山) rising from the sea — an island. 島 — Japan has 6,800+ 島; the character also appears in place names like 広島 and 島根.