MINDMAPS FOR UPSCPET 2026 · VISUAL REVISION
Isthmus, strait and island channels
Compare narrow land bridges, water passages and three-sided boundaries
Landforms, channels and borders
Isthmus vs strait
- An isthmus is narrow land joining two larger landmasses and separating water bodies.
- A strait is a narrow water passage joining water bodies and separating landmasses.
- Memory pair: an isthmus bridges land (Panama), whereas a strait bridges water (Palk).
Peninsula, island and archipelago
- A peninsula is surrounded by water on most sides but remains connected to larger land.
- Island: land completely surrounded by water; a grouped cluster is an archipelago.
- Lakshadweep and Andaman–Nicobar are Indian island groups.
Key maritime channels of India
- Six Degree (Great) Channel separates Great Nicobar (India) from Sumatra (Indonesia).
- Ten Degree Channel separates the Andaman Islands from the Nicobar Islands.
- Nine Degree Channel separates Minicoy from the main Lakshadweep group.
Read the relationship on a map
- Trace whether land or water remains connected across the narrow feature.
- For a channel question, identify the landmass on each side.
- A political border and a physical landform describe different kinds of relationships.
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