857 GHz Planck image containing the Cepheus Flare region (l ~ 100° − 116° and b ~ 9° − 25°). The four cloud complexes L1147/1158, L1172/1174, L1228, and L1251 studied here are identified and labeled. The arrows drawn in cyan show the direction of motion of the clouds in the sky plane inferred from the proper motion values (Gaia EDR3) of the YSOs associated with the clouds. The median distances of the YSOs estimated using the Gaia EDR3 in this study are also given.