Sailing Guide

Haa-Alifu ou Ihavandiffulu Atoll

Haa-Alifu ou Ihavandiffulu Atoll

Characteristics

Description

Ihavandiffulu Atoll is the N atoll of the Maldive islands.
It is divided into two administrative areas: Alifu Alifu N and S.
The Ari atoll, one of the largest in the Maldives with its 80km long and 30km wide, is divided into two administrative areas: Alifu Alifu N and S.
Ari N also includes two small atolls Rasdhoo (9 km in diameter) and Thoddoo. Its capital Rasdhoo Island, while Ari S Mahibadhoo's capital.
Thodhoo is known through all the Maldives for its watermelons, but also to archaeological discoveries have been made in 1958, which revealed that the island was an important Buddhist center of the country before converting to Islam.
The atoll consists of about 70 islands of which 18 are inhabited and 25 of which are devoted to tourism. Most of these islands in the atoll are large with abundant vegetation and what is not common, they are all located on the outer parts of the atoll.
In the E half of the lagoon depths are 37 to 55m and from 18.3 to 37 m in the W half of the lagoon. Many shoals in the lagoon are particular in the W. These shoals, when the sun rises, can be recognized by their pale green contrasting with the dark tone of deeper water, they are not easily visible if the sky is overcast.
The main occupations are fishing and the cultivation of coconuts, most of the islands being heavily wooded with palms.
Tides—Currents.—Currents at Ihavandiffulu Atoll are only experienced occasionally and are probably influenced entirely by local weather conditions. There appears to be no regular tidal
currents.
A current of 2 knots setting N was experienced about 50 miles E of the atoll (December), but practically no current in this position was experienced about a month later.
During December and January in the offing, the current generally sets N or W, but it is irregular.
A set to NW between Uleguma and Wagaru, and to W between Uleguma and Murdu, was sometimes observed. The maximum velocity was about 1 knot. In the middle of the lagoon there was an occasional set to NW.
Vessels approaching from N enter through North Rock Passage, between Wagaru and North Rock, 1 mile W; through North Western Entrance, between Wagaru and Turakana; or through Northern Entrance, between Turakana and Ulegama.
North Rock Passage may be entered in depths of not less than 18.3m by keeping towards Wagaru; the other entrances have depths of not less than 20.1m in the fairway midway between the islands, but there are shallower depths close within the lagoon in the Northern Entrance. The edges of the reefs on each side of the passage can be seen from aloft at a good distance.
Vessels approaching from E use North Eastern Entrance between Ulegama and Murdu, about 1.8 miles SE, or East Entrance between Muladu and Gallandu. 
North Eastern Entrance has a least depth of 35m midway between the islands.
In East Entrance, there is a shoal patch midway between the flanking islands and a second patch farther SSW. If using this entrance, bring the NE end of Medfuri to bear 287° and enter the lagoon on this heading. When the S end of Muladu bears 070°, steer for the N end of Hauwandu bearing 250°, and then to the anchorage off that island.
Caution.—Collingrufuri, Medufuri, and Manafur, three islands surrounded by rocky heads, foul ground, and shoal water, lie about 3.3 and 3 miles N, and 2.3 miles NNE, respectively, of Ihavandu. Two drying rocks lie on a rocky shoal close N of Medufuri.
Endeavour Shoal, a large coral patch with a least depth of 6.1m, lies about 3.3 miles SSW of Uleguma.
Ormonde Rock, with a least depth of 4.6m, lies about 2 miles SW of Ulegama.
In addition, there are numerous shoals and rocky patches in the lagoon, particularly toward the NW and SW sides; under suitable conditions all can be easily seen from aloft.
3/11/2011
Update
JB Antibes
Ihavandiffulu Atoll est l'atoll N des îles Maldives.
Il est séparé en deux zones administratives: Alifu N et Alifu S. 

L'atoll d'Ari, l'un des plus vastes des Maldives avec ses 80km de long et 30km de large est séparé en deux zones administratives: Alifu N et Alifu S.

Ari N comprend également les deux petits atolls de Rasdhoo (9 km de diamètre) et de Thoddoo. Il a pour capitale l'île de Rasdhoo, alors qu'Ari S a pour capitale Mahibadhoo.

Thodhoo est réputé à travers toutes les Maldives pour ses pastèques, mais également pour les découvertes archéologiques qui y ont été faites en 1958, lesquelles révélèrent que l'île était un important centre bouddhiste avant la conversion du pays à l'Islam. 

L'atoll comprend environ 70 îles dont 18 sont habitées et dont 25 sont consacrées au tourisme. La plupart de ces îles, dans l'atoll, sont grandes avec une végétation abondante et, ce qui n'est pas courant, elles sont toutes situées sur le versant extérieur de l'atoll.

Dans la moitié E du lagon les profondeurs sont de 37 à 55m et de 18,3 à 37 m dans la moitié W du lagon. De nombreux hauts-fonds se trouvent dans le lagon et notamment dans la partie W. Ces hauts-fonds, lorsque le soleil se lève, peuvent être reconnus grâce à leur couleur vert pâle contrastant avec le ton foncé de l'eau plus profonde; ils ne sont pas facilement visibles si le ciel est couvert.
La principale occupation est la pêche et la culture des noix de coco, la majorité des îles sont couvertes de palmiers.
Marées—Currents.Les courants sur l'atoll Ihavandiffulu sont probablement entièrement influencés par le temps local. 
Un courant de 2 noeuds venant du N a été relevé en décembre, à environ 50 NM à l'E de l'atoll, mais pratiquement aucun courant dans cette zone, n'a été observé un mois plus tard.
Pendant les mois de décembre et de janvier le courant vient du N ou de l'W, mais est irrégulier.
Les navires qui approchent l'atoll par le N entrent par le North Rock Passage, entre Wagaru et North Rock, à 1 mile à l'W; par l'entrée Nord-Ouest, entre Wagaru et Turakana, ou par l'entrée Nord, entre Turakana et Ulegama.
North Rock Passage est profond d'au moins 18,3 m en longeant Wagaru; les autres entrées ont des profondeurs d'au moins 20,1 dans le milieu de parcours entre les îles, mais il ya des profondeurs plus faibles à proximité de la lagune dans l'entrée Nord. Les bords des récifs de chaque côté du passage peuvent être vu à une bonne distance.
Les navires qui approchent par l'E utilisent l'entrée Nord Est entre Ulegama et Murdu, à environ 1,8 miles au SE, ou à l'entrée Est entre Muladu et Gallandu.
L'entrée Nord-Est a une profondeur minimale de 35m à mi-chemin entre les îles.
Dans l'entrée Est, il ya un haut-fond à mi-chemin entre les îles et un second haut-fond plus loin au SSW. Si vous utilisez cette entrée, passer à l'extrémité NE de Medfuri en navigant au 287 ° et entrer dans le lagon. A l'extrémité S de Muladu prendre le 070 °, faire cap sur l'extrémité N de Hauwandu au 250 °, puis mouiller en face de cette île.
Attention.-Collingrufuri, Medufuri et Manafur, ces trois îles sont entourées par des têtes rocheuses, des eaux peu profondes, et se situent à environ 3,3 et 3 milesau  N et  2.3 miles au NNE, respectivement, de Ihavandu. Deux rochers émergés se trouvent sur ​​un haut-fond rocheux proches au N de Medufuri.

Un courant de NW entre Uleguma et Wagaru, et d'W entre Uleguma et Murdu, a été observé quelquefois. La vitesse maximum est d'environ 1 noeud. Au milieu du lagon il y a occasionnellement un courant de NW.

Endeavour Shoal, un haut-fond de corail avec une profondeur minimale de 6,1 m, se trouve à environ 3,3 miles au SSW de Uleguma.
Ormonde Rock, avec une profondeur minimale de 4,6 m, se trouve à environ 2 miles au SW de Ulegama.
En outre, il y a nombreux bancs rocheux dans le lagon, en particulier vers le NW et SW; dans des conditions appropriées tout peut être facilement vu depuis la mâture.

3/11/2011
Update
JB Antibes
Haa-Alifu ou Ihavandiffulu Atoll
Haa-Alifu Atoll
7/01/2008
Update
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Localisation

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Sites around Haa-Alifu ou Ihavandiffulu Atoll
Flying distances - Direct line

Barrier reef of Ihavandiffulu atoll

Hauwandu, about 0.8 mile W of Ihavandu, lies at the SE end of a section of the barrier reef which extends about 9 miles NW, then 3 miles NE; of the eight islands and islets on this stretch of reef, Umbala and Hatefuri were inhabited in 1970.
Umbala, with a large ...
22 Oct 11

Kelai (N Tiladummati)

Kelai, at the NE extremity of the atoll, was inhabited in 1970. Good radar returns have been reported from Kelai at 14 miles. The islet of Tinadu lies about 3 miles WSW of Kelai.
25 Oct 11

Maduni Faro (N Tiladummati)

Maduni Faro, a lagoon reef, forms the NW extremity of the atoll.
The islets of Marandu, Tukandu, and Miledu, the first two inhabited in 1970, lie, respectively, on the barrier reef between the N end of Maduni Faro and the islet of Gafuri, about 5 miles ESE. Gafuri ...
25 Oct 11

Digufuri reef (Ihavandiffulu)

Digufuri Reef (Digfurhi Reef), at the S end of Ihavandiffulu Atoll, has an islet at its E end; a small sandbank, with palms on it, lies about 0.8 mile ENE of the islet.
21 Oct 11

Warifuri Faro (N Tiladummati)

Warifuri Faro is a large lagoon with the islet of Warifuri at its S end. A lighted beacon lies on the N side of Warifuri Faro. The islets of Dedu and Warifuri are inhabited; the islet of Noradu lies between the latter two islets.
25 Oct 11

Ihavandhoo (Ihavandiffulu)

Ihavandu, one of the few islands within the lagoon, lies close N of Digufuri Reef and about 3 miles W of Gallandu.
The island is densely populated, and there is a landing on the S side.
21 Oct 11

Anchorage E Hauwandu

There is a good anchorage E of the reef between Hauwandu and Umbala, in the SW part of the lagoon, in 33 to 37m.
This is probably the best anchorage during the Southwest Monsoon, but a heavy swell might reach it through Southwestern Entrance.
24 Oct 11

Gallandu (Ihavandiffulu)

The islet of Gallandu (or Gallandhoo) lies about 3.5 miles SSW of Muladu.Sunken reefs lie about 1 and 2 miles, respectively, N of Gallandu.
21 Oct 11

Mulladu (Ihavandiffulu)

Muladu, about 5 miles SE of Ulegama, has a small village on its W side. There is a boat passage, abreast the village, through the otherwise unbroken reef surrounding the island.Between Muladu and Ulegama lie three small thickly-wooded uninhabited islets known from NW ...
20 Oct 11

Uligamu (Ihavandiffulu)

Ulegama, about 1.3 miles SE of Turakuna, is low, level, and thickly wooded. The village lies near the center of the island, surrounded by coconut palms and breadfruit trees. 
A narrow reef fringes the seaward side of the island; a beacon lies on this reef ...
21 Oct 11

Filadu (N Tiladummati)

The island of Filadu has an opening between it and Kelai, 1.5 miles N, and between it and Baura, 3 miles SSW, but the latter is encumbered by several rocky patches in the fairway.
26 Oct 11

Turakuna (Ihavandiffulu)

Turakuna the N island of Ihavandiffulu Atoll, was inhabited in 1970 with a small village on its N side.
On its S side, landing can be effected through a gap in the encircling reef.Good radar returns have been reported from Turakuna at 15 miles.
21 Oct 11
Local Area

Maldives

The Republic of Maldives is a SW Asian country. The population of the Islamic Republic is about 300 000 inhabitants. The capital is Male. The language "Devehi" comes in part from an ancient form of Sri Lancans mixed with Hindi, Arabic and English. English is the ...
16 Nov 11

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

Gallandu channel

Gallandu Channel, between the S end of Ihavandiffulu Atoll and the NW end of Tiladummati Atoll, about 2.8 miles S, is very deep and free from dangers in the fairway.
Passages on each side of the channel lead into the lagoons, where anchorage may be obtained.Tides—Currents.—Tidal ...
25 Oct 11

Tiladummati Atoll (Haa-Dhaalu) (Maldives)

Thiladhunmati Atoll (Tiladummati in the Admiralty Charts) is a very open, atypical atoll without a clearly delimited lagoon. It stretches SSW for 76 km and contains nearly forty islands generally of a fair size.
Tiladummati Atoll consists of about 40 islands and islets; ...
4 Nov 11

Miladummadulu Atoll

Miladummadulu Atoll contains about 100 islands and islets lying principally on the E side; over 40 of these were populated in 1970, and almost all are wooded, with palms predominating.
Miladummadulu Atoll lies on the same submarine plateau as Tiladummati Atoll and ...
7 Jul 12

Malosmadulu Atoll (Maldives)

Malosmadulu Atoll consists of North Malosmadulu Atoll and South Malosmadulu Atoll, which are separated by Moresby Channel, about 1.8 miles wide.
These two atolls are similar in character, their W sides being composed of a series of lagoon reefs, some prominent and ...
8 Nov 11
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