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Sector 9. The Bismarck Archipelago

9.68

Caution.—The Admiralty Islands have not been completely

surveyed and vessels should navigate with caution in this area. Numerous uncharted reefs are reported to exist in the sea area bounded by the Western Islands (2°13'S., 145°54'E.), the SW extremity of Manus Island, Mbuke Island and Petersen Reefs. Many reefs and uncharted dangers are between Mbuke Island and the S coast of Manus Island.

9.68

Water spouts are frequently seen in the vicinity of the Ad-

miralty Islands. Large quantities of floating pumice stone have been sighted W of the Purdy Islands; they appeared as flat islands from the offing.

9.68

Submarine disturbances have been reported about 3 miles

SSE and 1 mile S of the S end of Lou Island. The SW entrance of St. Andrew Strait has been reported to be foul. A con- siderable area of foul ground has been reported in the N en- trance of St. Andrew Strait. The islands in the vicinity of this strait have been reported to be incorrectly charted.

9.68

The relative positions of Lou Island, the Fedarb Islands, and

the St. Andrew Islands are reported to be in error. The outline of Lou Island is also reported to be in error.

9.68

Shoal water has been reported between the Papialou Islands

and Alim Island. A 14.6m bank has been reported about 18 miles SE of the Papialou Islands.

The islands and dangers W of Rambutyo Island have been reported to be incorrectly charted.

9.68

9.69 The S coast of Los Negros Island and the SE coast of

Manus Island are fringed by a narrow reef. Patamu Island is about 1.8 miles S from the W entrance point of the small bay between Manus Island and Los Negros Island. The enclosing reef extends 274m S from the island and forms the N side of the preferred channel into Kelaua Harbor.

9.69

Kelaua Harbor (2°06'S., 147°16'E.) is small and has a num-

ber of reefs in its entrance. The reef which supports Patamu Island extends 0.1 mile S from that island to the N side of the preferred channel into Kelaua Harbor. A reef, extending 91 to 183m offshore, fringes the N and S shores of the bay. Shoal ground, defined by the 1.8m depth line, extends 0.4 mile from the head of the bay. The village of Lauis is on a chain of hills, about 3 miles upriver of the entrance of the Lauis River, which discharges into the head of the bay.

9.69

Anchorage.—Anchorage can be taken, in about 31m, with

the N end of Patamu Island bearing 080° and the S entrance point of the harbor bearing 131°. Vessels entering the harbor should do so with the sun abaft the beam, because the reefs are then more easily seen. The fringing reef of Patamu Island should be kept aboard until Inner Reef is identifiable, the pass- age N of which is to be preferred. Anchorage may be obtained by vessels with local knowledge, in depths of from 27 to 37m, in the S part of Kelaua Harbor, where there is room for several vessels.

9.69

Caution.—Outer Reef, 0.4 mile ENE of the S entrance point

of the bay, has a least depth of 1.8m. Southward and SW of it are two reefs, with depths of 2.4m.

9.69

Island. Island.

9.69

Middle Reef, with a depth of 4m, is about 600m S of Patamu Inner Reef, with a depth of 0.9m, is 700m SW of Patamu

259

9.70 Between Sanders Point, 7.5 miles SW of the S en-

trance point of Kelaua Harbor, and South West Point, the ap- proaches to the S shore of Manus Island are encumbered with reefs, shoals, and coral-fringed islands and islets lying up to 43 miles offshore.

9.70

Sanders Point is low and can be identified by a white sandy

beach and a large clump of coconut palms, the only ones in the vicinity. The point is fringed by a wide reef which is reported to have extended farther W and S than charted.

9.70

Big Ndrova Island and Little Ndrova Island are close to-

gether, 2 miles ESE of Sanders Point, with a clear passage between them. Big Ndrova Island is 41m high.

9.70

Between Sanders Point and Sabumo Point, about 14 miles

W, the coast is indented by two foul bays and is fronted by many dangers. Sabumo Point, low and wooded, is the termina- tion of a range of mountains sloping gently toward the sea. Ndruval Island, 29m high and 1.5 miles SE of the point, is sandy and covered with a kind of reed grass. There are two hummocks on the island.

9.70

Between Sabumo Point and South West Point, about 26

miles W, the coast is fronted by numerous dangers. Malai Bay and South West Bay, separated by a large headland, indent the W part of this coast. Both bays are lined with mangroves, foul, and suitable only for small vessels with local knowledge. South West Point is moderately high and densely wooded.

9.70

Between this point and Alacrity Point, about 4.5 miles NNW, a reef fringes the shore to a distance of 2 miles. The coast is broken and rugged, and indented by many foul inlets. The veg- etation along this coast is dense.

9.70

Between Alacrity Point and Sopa Sopa Head, the coast is

very irregular, fringed by reefs, and fronted by dangers. Kali Bay, which indents this coast, has not been closely examined. It is said to be foul.

9.70

Caution.—The W approach to Manus Island is encumbered

by shoals, reefs, and reef-fringed islands extending up to 20 miles off the S end. These dangers are more widely separated and are nearer to the N part of the coast.

9.70

Bipi Island (2°06'S., 146°24'E.), about 1 mile long and 9.1m

high, is about 8 miles NW of Alacrity Point. Sisi Liu Island, 9.1m high and somewhat smaller than the above island, is about 1.5 miles NE of it, and Pahi Islet is about 2.8 miles farther NW. The islands are surrounded by reefs, and foul ground is between them and the Manus Island coast.

9.71 The N coast of Manus Island is fronted by a broken

line of barrier reefs, approached through unobstructed water with general depths over 56m. The line of reefs lies between 2.5 and 5.5 miles from the coast and extends from a position N of Sopa Sopa Head to the NW point of Los Negros Island. The E end of the lagoon formed between the barrier reefs and the coast formed by Los Negros Island. Deep navigable passages extend through the barrier reef, but the lagoon is considerably encumbered with scattered reefs, shoals, rocks, and reef- fringed islands.

9.71

Caution.—Firing exercises take place N of Manus Island in

an area bounded by a line joining position 1°47'S, 147°40'E and position 1°47'S, 147°00'E. A navigation warning is broad- cast when such exercises are in progress.

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