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HYDROGRAPHY. 



ONGEA. 



Ongea is formed of two islands, called Levu and Riki, which are 

 enclosed in the same reef: these are both barren and destitute of 

 water ; they are some 200 feet high, round or dome-shaped, and both 

 together 4z miles long, north and south, and one mile wide : there are 

 three entrances for small vessels, two at the north, and the third at 

 the western side ; the latter leads to Port Refuge. To the southeast of 

 the south island, three miles distant, lies a dangerous sandbank and 

 coral reef, called Nugu Ongea : this must claim the attention of navi- 

 gators when approaching this extremity of the group. Due regard 

 should be paid to the current, which sets with some force to the north- 

 ward and eastward. 



To the north of Ongea there are three coral reefs, viz., Teteka, Nisu- 

 kisuki, and Revareva, which the charts show, rendering the passage 

 between it and Angasa extremely dangerous. 



ANGASA. 



Within the reef which surrounds this island there are three smaller 

 ones, Abutolema, Abutuena, and Abuda. Angasa is the most eastern 

 and largest ; it is remarkable for its regular ridges, of volcanic forma- 

 tion. The reef encompassing these islands is 8 miles northwest and 

 southeast, and 5 northeast and southwest : there are no openings 

 through it, and no permanent inhabitants on either of the islands. To 

 the north-northeast of Angasa lies the Levu Reef, distant three miles 

 from the reef of Angasa; and to the east Chicondua and Konaivo, the 

 latter including an islet. Angasa forms nearly an ecpailateral triangle 

 with Fulanga and Ongea, of which the sides are about 8 miles. 



MORAMBA. 



Moramba lies northwest of Fulanga, 9 miles distant ; it is but half 

 a mile in diameter, high and well wooded, with a shore-reef ; it has no 

 convenient landing. 



NAMUKA. 



Namuka rises to the usual height of these islands, is of the same 

 formation, and lies north of Fulanga 15 miles. It is three miles in 



