Motu Katava is linear ovate in outline, a little less than a mile long N.W. and S.E. and about 1/2 mile wide, at widest place which is at about the middle, but W. of landing bay (lagoon side). The vegetation is very dense at the W. end, (the most luxurient of that on any of the three islands) with tall Buka trees, dense undergrowth of small trees and shrubs and large birds- nest ferns. At the E. end the vegetation is the usual low, dry type, although there is a patch of conspicuous tall Buka trees a little E. of the middle. Motu Katava is perhaps 3 to 4 miles S. S.W. of Puka Puka, the broad connecting reef being continually awash. Katava and Koe are less than 1 1/2 miles apart, the broad, flat connecting reef also being always awash. The total height of the island including the vegetation, does not exceed 80 feet, the ground not rising over 40 feet and none of the trees being over 40 to 45 feet high, the highest growing in depressions. The heights on chart 1960 are much overestimated, Katava being the highest. Puka Puka next with less than 80 feet, and Koe the lowest, nowhere exceeding 60 to 65 feet. The slopes there given, especially of Koe indicate that the two southern islands were not visited when survey was made. Fresh water is to be found on Katava, both about the huts, on the N.E. side, to which the inhabitants of Puka Puka move during copra gathering season, and in the seep holes in the center, where taro and bananas are grown. The vegetation is about the same as on Puka Puka, no new plants being noted except a giant taro with a large candle-like flower enclosed in purple sheath, 10 to 12 feet high, leaves 2 1/2 by 4 feet, and a tree with thick, dark green ovate leaves and fig shaped orange fruit. The insects were much the same, with additions as follows:- Small yellow-brown centipeds, termites and purple scorpions under rotting bark and fallen dry coconuts; black and brown beetles, pale yellow cranefly, black Agromyzid fly, red-black spotted coccinellids, Odymeus-like wasp, all on Scaevola. Mites, sowbugs, orolaid mite.