UPSC Prelims Current Affairs for 18 September 2026

UPSC Prelims Current Affairs for 18 September 2026 brings together the news items of the day that map to the Prelims syllabus — polity, economy, environment, science and technology, and international relations. Each item is written as a factual pointer you can revise quickly, with the static-syllabus link made explicit so the reading feeds directly into your Prelims notes.

3 articles

Taklamakan Desert

Location: Xinjiang Uyghur Autonomous Region, China. Region: Located in the Tarim Basin of Central Asia. Nature: One of the largest sandy deserts in the world. Climate: Continental climate with a very arid, cold-desert environment. Surrounding Mountains: Kunlun Mountains — South Tian Shan Mountains — North Pamir Mountains — West River: The Tarim River runs along…

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Siang River

Location: Arunachal Pradesh. Source (Upper Course): The river originates in the Tibetan Plateau, where it is called Tsangpo/Yarlung Tsangpo. Indian Name: After entering Arunachal Pradesh, it is called the Siang or Dihang. River System: A major tributary of the Brahmaputra. Course: It flows through the mountainous region of Arunachal Pradesh before entering Assam. Confluence: In…

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Semiconductor India 2026

SEMICON India: Platform to strengthen India’s semiconductor ecosystem, making the country a global hub for electronics manufacturing and design. Nodal Ministry: Ministry of Electronics and Information Technology (MeitY). India Semiconductor Mission (ISM): Nodal agency for semiconductor and display-manufacturing schemes. Focus Area: Laid the foundation to create an entire semiconductor and display ecosystem, aligned with the…

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