science

Lansdowne Reef

Lansdowne Reef is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lansdowne Reef rather than just read about it. In short: Lansdowne Reef (Filipino: Bahura ng Burunyugan 8; Len Đao Reef Vietnamese: Đá Len Đao; Chinese: 琼礁; pinyin: Qióng jiāo), is a cay on the southern part of the Union Banks of the Spratly Islands in the South China Sea. The island has been occupied by Vietnam since 1988.

Key takeaways

Lansdowne Reef belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lansdowne Reef to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lansdowne Reef from memory before moving on to harder problems.

Reference excerpt

Lansdowne Reef (Filipino: Bahura ng Burunyugan 8; Len Đao Reef Vietnamese: Đá Len Đao; Chinese: 琼礁; pinyin: Qióng jiāo), is a cay on the southern part of the Union Banks of the Spratly Islands in the South China Sea. The island has been occupied by Vietnam since 1988. It is also claimed by China (PRC), the Philippines, Vietnam, and Taiwan (ROC).

Geography Len Dao Reef is located 6.4 nautical miles (11.9 km; 7.4 mi) northeast of Gac Ma Reef and 6.8 nautical miles (12.6 km; 7.8 mi) south-southeast of Sinh Ton Island. Geographically, Len Dao Reef is not an island but a coral reef. When the tide is low, the coral reef rises approximately 0.5 metres (1 ft 8 in); conversely, when the tide is high, the reef submerges 1.8 metres (5 ft 11 in) below water. The area of the coral reef is approximately 0.58 square kilometres (0.22 sq mi). The Vietnamese Navy is stationed on a complex of structures called Len Dao Island, with geographical coordinates recorded on the sovereignty marker as 9°45′40″N 114°21′50″E. There is also a stone cultural house completed in 2018. Starting in June 2025, Vietnam began land reclamation activities at Len Dao Reef. The island expanded to a total of 4 hectares (9.9 acres).

Illustrations

Worked examples

Example 1 — a first encounter with Lansdowne Reef

Start with the simplest possible case. Write down what Lansdowne Reef claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lansdowne Reef before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lansdowne Reef ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lansdowne Reef

In research: Lansdowne Reef appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lansdowne Reef in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lansdowne Reef is common in secondary-school and first-year university syllabi. It links to neighbouring topics Asia geography stubs, Island stubs, Reefs of Vietnam, so understanding it makes those chapters shorter.
In everyday life: Look for Lansdowne Reef outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lansdowne Reef in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lansdowne Reef means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Lansdowne Reef out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lansdowne Reef in simple terms?

Why does Lansdowne Reef matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lansdowne Reef?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lansdowne Reef.