... It is more convenient to study the process of perfect flora revealing on the objects with clear natural borders, such as islands and lakes. ... We also compared our floristic lists for the two islands of the Chupa bay with analogous lists, got in the beginning of August 2001 (White sea expeditions…, 2001; Abramova et al., 2003) to reveal the changes in islands flora during these five years. ... Different species were usually overlooked on the close islands with similar flora. ... Chupa bay islands ....