Introduction and Syllabus Scope

The RPSC 2026 syllabus for Paper II, Unit 3 (Earth Science/Geography) covers this topic under Part C. The scope encompasses three interconnected sub-topics: the four physiographic divisions of Rajasthan (land surface forms), the river systems and their drainage basins, and the major lakes (both natural and artificial). All three must be covered because RPSC frequently asks questions that cross sub-topic boundaries — for example, linking the Aravalli Range to its role as a watershed between river systems.

The PYQ Tier 3 classification (4/5 exams, avg 2.8 marks) reflects consistent but not dominant testing: RPSC typically asks one 5-mark factual question per exam rather than a full 10-mark analytical question. However, the 2026 revised syllabus places additional emphasis on geographic data, making a 10-mark question in 2026 more probable. Students who know only the "names" of rivers and lakes will score 3–4/5; those who know lengths, tributaries, drainage basin divisions, dam specifics, and lake dimensions score the full 5/5 or achieve distinction in a 10-mark response.

Adjacent topics provide essential context: Topic #84 (climate) explains why western Rajasthan rivers are seasonal; Topic #85 (vegetation) connects to the watershed ecology; Topic #86 (soils) links to alluvial deposits in river plains; Topic #88 (minerals) explains the geological underpinning of the Aravalli landforms and why it hosts specific minerals. Cross-reference throughout.

This chapter covers: the four physiographic regions with precise area percentages and landform types; the full river classification by drainage basin (Arabian Sea, Bay of Bengal, inland); key rivers with origins, lengths, tributaries, and associated projects; and all major lakes with dimensions, locations, and significance.

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