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Lombok Strait

geography Maturity 11-13 Next article →

The Lombok Strait is a vital waterway located in Indonesia. It sits between the islands of Bali and Lombok.

Clouds over Lombok Strait, Gili Islands, West Nusa Tenggara, Indonesia
Clouds over Lombok Strait, Gili Islands, West Nusa Tenggara, Indonesia

The Gili Islands are positioned on the Lombok side of this passage. This strait serves as a connection between the Bali Sea and the Indian Ocean. It is a major route for global maritime trade. Many large ships use this path to travel between oceans. Because it is very deep, it is a critical part of the world's shipping network.

One of the most important functions of the strait is moving water. This process is known as the Indonesian Throughflow, or ITF. The ITF acts as a massive exchange system. It moves water between the Pacific Ocean and the Indian Ocean. This movement is influenced by oceanic tidal mixing and seasonal changes. The strait is a known hotspot for intense tidal mixing. This happens because of the rough underwater topography in the area. Specifically, large tides convert into internal tides near the Nusa Penida Sill. This sill is a feature in the strait that reaches 350 meters in depth.

The deep water of the strait creates a famous biological boundary. This is called the Wallace Line. It is named after the naturalist Alfred Russel Wallace. He observed that animals on either side of the strait were very different. One side belongs to the Indomalayan realm. The other side belongs to the Australasian realm. Biologists believe the depth of the strait kept these animals isolated. During the Pleistocene ice age, sea levels dropped significantly. Bali, Java, and Sumatra were connected to the Asian mainland. However, the deep Lombok Strait kept Lombok and the Lesser Sunda archipelago separate. This allowed Australasian fauna to colonize those islands instead.

Marine life in the strait is incredibly diverse and rich. A 2001 expedition by several organizations found some of the world's richest coral reefs here. The area contains many different groups of sea life. These include stony corals, known as Scleractinia, and soft corals, called Octocorallia. You can also find sponges, snails, and many types of fish. The habitat is shaped by volcanic and limestone sediments. It also features sandy reef slopes and strong currents. Many marine mammals live in these waters. These include longnosed spinner dolphins and bottlenose dolphins. However, some species face threats from intense fishing activities.

The strait is also a busy corridor for the global oil trade. Because much of the world's crude oil moves through this route, pollution can occur. Some marine bacteria have adapted to this environment. These are called hydrocarbonoclastic bacteria, or oil-degrading bacteria. They can break down polycyclic aromatic hydrocarbons, which are chemicals found in oil. Scientists have identified several specific strains in the strait. These include colonies named LS-3, LS-13, and LS-20. These bacteria can appear in colors like yellow, white, or purple. They have the potential to help clean the marine environment.

Climate and weather also play a huge role in the strait. The Indonesian Throughflow helps regulate the heat in the Indian Ocean. The water's heat content is influenced by the Asian monsoon season. This season occurs from December to May. The monsoon also brings fresh water to the Java Sea. This fresh water changes the salinity, or saltiness, of the Lombok Strait. This makes the water there different from nearby areas. The strait also experiences strong semi-diurnal tides. These tides can reach an amplitude of about 90 meters. The water has a layered structure with different flows at different depths.

Because it is a major shipping route, the strait faces maritime security challenges. Large vessels, called "post Malaccamax" ships, use the strait because it is deeper than the Strait of Malacca. This high volume of traffic brings risks like piracy and illegal fishing. Indonesia manages these issues through several strategies. One major policy is the Global Maritime Fulcrum. This plan focuses on building the maritime industry and improving defense forces. The government also creates Marine Protective Areas to help conserve the environment. These efforts aim to protect both the economy and the natural world.

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File:Clouds over Lombok Strait, Gili Islands, West Nusa Tenggara, Indonesia.jpg
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