The islands of Ritchie's Archipelago run in a closely spaced arc which extends about from the southernmost Rose Island. to North Button I., with Diligent Strait between them and Great Andaman ranging from to less than . Most of the islands are clustered closely together separated by only narrow, almost river-like channels. The exceptions are Rose Island and Neill Island to the south of Havelock Island, and the three small Button islands which are smaller outliers to the north of the group.