Radical 足
7 strokes
mouth 口 (5) + stop
(30a) = foot 足
When foot appears as the left-hand side of another character, the bottom is distorted (and looks more like 29a than 30a — see Character 283 below for an example).
[满足 (225) mǎnzú satisfy]

At the mouth of the cave they all stopped — nobody dared put a foot inside. / Only when the fairy zoomed in to check it out did they relax.