Sailing Guide

Selat Siberut (W Sumatra)

Selat Siberut (W Sumatra)

Characteristics

Description

Selat Siberut, between Pulau Bojo and Pulau Siberut, is about 21 miles wide.
Selat Siberut is the passage usually taken by vessels bound to Teluk Bayur from N.

Low-powered vessels from the Indian Ocean bound to Selat Sunda between May and september, and all vessels bound N from Selat Sunda between November and March, use this passage.

There is generally a long line of surf on the shores of the strait, particularly on its N and W portions. In the E portion, and under the Pulau Siberut shore, there is shelter from the sea which causes heavy surf on the N shore, where all the dangers lie within the 5.5m line.

Vessels approaching Selat Siberut from the W should steer to pass about 2 miles S of the W point of Pulau Tanahbala, and will sight Pulau Bodjo with its lighthouse.

The best course is to pass between Pulau Bodjo and Makasser Reef, which is clear of all danger; the reef is nearly always to be seen by the breakers.

The island should be passed at a distance of 2 miles, steering about 090°, until Tanjung Sigep bears 155°, when a course may be shaped for the desired port.

Vessels approaching Selat Siberut from the W should steer to pass about 2 miles S of the W point of Pulau Tanahbala, and will sight Pulau Bodjo with its lighthouse.

The best course is to pass between Pulau Bodjo and Makasser Reef, which is clear of all danger; the reef is nearly always to be seen by the breakers.

Winds—Weather

From November to May, when the Northeast Monsoon prevails S of the Equator, the weather is fine in Selat Siberut, with light S and SW winds. The wind is rarely stronger than force 2; in March and April strong W squalls lasting about 10 minutes may be experienced. In the other months of the monsoon rain, squalls with little wind may be expected.

If the wind shifts to S during the Southwest Monsoon period, which usually occurs between June and September, hard NW and W winds prevail in Selat Siberut, accompanied by heavy squalls.

Tides—Currents

The tidal currents are reported to be irregular.
Sometimes a W set is experienced for several successive days; at other times, an E set is experienced, with the latter being generally the weaker.

After a few days of light winds the currents turn at about HW and LW. The strongest currents are found close to the shores, where, N of Tanjung Sigep (0°54'S., 98°54'E.), the N extremity of Pulau Siberut, and between Pulau Bodjo and Pulau Tanahbala, they sometimes attain a rate of from 2 to 3 knots. In the latter vicinity the flood sets ENE and the ebb WSW.

7/02/2012
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Localisation

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Sites around Selat Siberut (W Sumatra)
Flying distances - Direct line

Gosong Makasar (W Sumatra)

Gosong Makasar (Makasser Reef), with a depth of 0.6m, lies about 12 miles SSE of the S extremity of Pulau Bodjo. It is easily recognized in the daytime by the high breakers on its shallow portion.
The reef extends 1 mile beyond the breakers.
7 Feb 12

Karang Posumah (Van Bylandt Reefs) (W Sumatra)

Karang Posumah consists of two patches, located about 7 miles ENE and E, respectively, of Pulau Bodjo; they have depths of 4.9 to 5.5m.
The SW side of the bank is very steep-to, but the NE side is more shelving. The shallowest parts may occasionally be distinguished by the swell, ...
7 Feb 12

Pulau Bodjo (W Sumatra)

Pulau Bodjo, lying about 2 miles S of the SE extremity of Pulau Tanahbala, is densely woodedand about 150m high. It is fringed by a steep-to reef which nearly dries, extending about 0.3 mile offshore in places.
A light is shown from the S side of the island.
7 Feb 12

Karang Sirene (Sirene Reefs)

Sirene Reefs, one of the outermost dangers in this locality, consist of four heads, of which the westernmost and the southernmost, with 0.9m of water, sometimes break; there are depths of 1.4 and 6.9m on the other two patches.
7 Feb 12

Pulau Temang (W Sumatra)

Pulau Tamang (Pulau Temang) is an easily-identified hilly island (Area:10Km²with an average elevation of 1 m above the sea)  located at the SE extremityof Teluk Batahan, about 1 mile from the coast.
It is fringed by areef except at its W end, where there is a depth of 11m ...
7 Feb 12

Ujung Tuan (W Sumatra)

The coastal plain between the Sungai Singkil and Udjung Tuan, about 156 miles SE, is generally narrow, being backed by mountains with numerous peaks. Ujung Tuan is a rocky point. A 175m hill, with a remarkable broad conical summit, lies close SE of the point.To Udjung Tuan, about ...
7 Feb 12

Ujung Masang (W Sumatra)

Ujung Masang is low, with a reef stretching out about 0.5 mile and should not be approached in depths of less than 31m.
The Sungai Masang enters the sea at the point.
7 Feb 12

Ujung Sikarakara (W Sumatra)

The coast between Tanjung Tabujung and Ujung Sikarakar, about 14 miles S, is fronted by many dangers, some of which lie just within the 10m curve.
Natal Road that lies off the coast between Ujung Sikarakara and Ujung Rakat, about 6 miles S, is open W and is encumbered with many ...
7 Feb 12

Ujung Tabuyung (W Sumatra)

An above-water rock lies about 1 mile offshore, 14 miles N of Tanjung Tabujung.
Tabujung Road, located N of Tanjung Tabujung, is partly sheltered by Pulau Tangah (Pulau Tonga) and Pulau Si Dakah (Pulau Labu, about 4 and 1.5 miles, respectively, NW of Tanjung Tabujung.
6 Feb 12

Karang Makassar (E Nias)

Makassar Reefs are four isolated dangers, with depths of 3 to 8.2m, and deep channels between them.
They lie from 1.75 to 7 miles S of Sumabawa, and from 6 to 7 miles offshore. They are marked by breakers or a heavy swell.
6 Feb 12

Tanjung Hele (S Nias)

Tanjung Hele, the S point of Telokdalam, lies about 6 miles E of Teluk Lagudri.
A reef marked by discolored water and very high surf, extends SE from Tanjung Hele, which should be rounded at a distance of at least 1 mile.
6 Feb 12

Tanjung Tedulehu (Tedu Ichu or Todojghu) (E Nias)

From Telok Dalam, the coast trends NE for about 6 miles to Tg Tedulehu (Balo Todojghu, Ujung Tedu Ichu, a low point covered with coconut trees.
A number of villages lie scattered along this stretch of coast. A narrow reef fronts the shore, preventing loading in most places. With ...
6 Feb 12
Local Area

Sumatra W coast (Indonesia)

On the W coast of Sumatera there is a high, rocky coast, or if there is a strip of sand by the sea, the land rises rapidly behind it to the neighboring hills.
Numerous small streams discharge their waters on the W coast, but most of them are barred and only navigable by small craft. ...
1 Feb 12

Sumatra (Indonesia)

Sumatra (Indonesian: Sumatera) is an island in western Indonesia, westernmost of the Sunda Islands.
The longest axis of the island runs approximately 1,790 km (1,110 mi) northwest-southeast, crossing the equator near the centre. At its widest point the island spans ...
7 Jan 12

Indian Ocean

The Indian Ocean is the third largest of the world's oceanic divisions, covering about 20% of the Earth's water surface. It is bounded on the north by Asia (including the Indian subcontinent, after which it is named); on the west by Africa; on the east by Indochina, the Sunda Islands, ...
6 Apr 12

Karang Posumah (Van Bylandt Reefs) (W Sumatra)

Karang Posumah consists of two patches, located about 7 miles ENE and E, respectively, of Pulau Bodjo; they have depths of 4.9 to 5.5m.
The SW side of the bank is very steep-to, but the NE side is more shelving. The shallowest parts may occasionally be distinguished by the swell, ...
7 Feb 12

Pulau pulau Batu (Kepulauan Batu) (W Sumatra)

Pulau Pulau Batu (Kepulauan Batu), forming the S side of Great Channel (between Pulau Nias and Pulau Pulau Batu), consists of three large islands, Pulau Tanahmasa, Pulau Tanahbala and Pulau Pini, with numerous islands fringed by extensive coral reef.
7 Feb 12

Pulau Temang (W Sumatra)

Pulau Tamang (Pulau Temang) is an easily-identified hilly island (Area:10Km²with an average elevation of 1 m above the sea)  located at the SE extremityof Teluk Batahan, about 1 mile from the coast.
It is fringed by areef except at its W end, where there is a depth of 11m ...
7 Feb 12
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