坦 is a Japanese kanji written with 8 strokes, listed here under the keyword “flat”. It is built from 土 (soil) and 旦 (nightbreak). In Remembering the Kanji by James W. Heisig it is frame 2303.
On KumiJi Glyph Explorer, open the parts search and type “soil” + “nightbreak”. 坦 is among the results, together with every other character containing the same shapes.
Open 坦 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.