- They are aligned in north-east to south-west direction. They run for about 800 km between Delhi and Palanpur in Gujarat.
- They are one of the oldest (very old) fold mountains of the world and the oldest in India.
- After its formation, its summits were nourishing glaciers, and several summits were probably higher than the present-day Himalayas.
- Now they are relict (remnants after severe weathering and erosion since millions of years) of the world's oldest mountain formed as a result of folding.
- They continue up to Haridwar buried under the alluvium of Ganga Plains.
- The range is conspicuous in Rajasthan (continuous range south of Ajmer where it rises to 900 m.) but becomes less distinct in Haryana and Delhi (characterised by a chain of detached and discontinuous ridges beyond Ajmer).
- At the south-west extremity, the range rises to over 1,000 m. Here Mt. Abu (1,158 m), a small hilly block, is separated from the main range by the valley of the Banas.
- Guru Shikhar (1,722 m), the highest peak, is situated in Mt. Abu.
- Pipli Ghat, Dewair and Desuri passes allow movement by roads and railways.
