(1) Those of the atolls north of the Kardiva Channel.
Following the chain northward from this channel we have Haddumati and Kolumadulu, after which the chain becomes double: to the east the chief atolls are Mulaku, Felidu, South Male, North Male, Kardiva (where the channel of the same name, 35 m.
(2) Those of the central division, comprising the atolls between North Male and Haddumati, who are under the direct rule of the sultan, and have been more exposed to Arab influences.
" Sealark " and the German surveying-ship " Planet " to have a somewhat complicated configuration, the island groups and banks of atolls which occur there rising abruptly as a rule from depths of about 2000 fathoms or more.
TOKELAU (or Union Islands), a group of three atolls in the Pacific Ocean, about 350 m.