TRUK. 357 



Fanan (PI. 231). These islands are remnants of a volcanic ridge once 

 probably extending in the centre of the eastern part of the lagoon, more or 

 less parallel to the outer barrier reef flat.; they are separated by depths 

 varying from seventeen to twenty-four fathoms. To the eastward of 

 Ruk are four other volcanic islands, each about a mile in length. Tsis 

 Island runs in a northwestern direction, while Eiol, Periadik, and Tarik 

 (PI. 191, fig. 1) run in an easterly direction nearly parallel with the 

 principal range of Uola. To the west of the central line which divides 

 the lagoon of Truk into two almost equal parts is another group of 

 i.slands; the largest, Tol (PI. 193, fig. 2), is nearly seven miles in length, 

 running from southeast to northwest. A deep bight extends almost 

 one third the length of the island on the northeastern side, bounded 

 by a low peninsula rising not over 300 feet; it is connected by a nar- 

 row isthmus to the principal island. To the east of Tol is the triangu- 

 lar island of Fala-beguets, about one and one-half miles in length ; to 

 the north of Fala-beguets, the islands of Ulalu and Kuli ; they are about 

 three fourths of a mile long and run east and west. In an easterly 

 direction from Tol, near the central part of the atoll, lies the island of 

 Udot (PI. 193, fig. 2) ; it is Y-shaped, with one ridge running north and 

 south, and the other running in a southeasterly direction. To the west- 

 ward of Tol are two volcanic islands, Pata and Polle, the former about 

 one and three-fourths miles in length, and the latter nearly two and 

 one-half miles long. 



In the northern half of the atoll, about half-way between Udot and 

 the island of Pis, are two islands, the largest of which is Bi'ongniart 

 Island, a low sand island, over a mile in length, thrown up on an ex- 

 ten.sive reef flat (PI. 231). Several of the islands and islets near the 

 eastern and southern faces of the atoll are low sand islets thrown up on 

 some of the numerous coral reef shoals scattered over the southern half 

 of the lagoon of Truk. The southern part of the lagoon has been fairly 

 well surveyed and a number of lines of soundings extend across to the 

 northern part of the atoll. The islands thrown up on the outer barrier 

 reef flat on the eastern and northern coa.st are all noted for the high 

 shingle beaches facing the sea, and the steep fine coral sand beaches 



