The maximum depth of Lithosphere is found in the

The lithosphere consists of the Earth's crust and the uppermost portion of the mantle [2]. Its thickness varies significantly across the globe, ranging from a few kilometers at mid-ocean ridges to approximately 200-300 km beneath continental areas [3]. While oceanic lithosphere is generally thinner and denser, continental lithosphere is thicker, particularly beneath major mountain systems [4]. The continental crust alone reaches its maximum thickness of about 70 km in the Himalayan region [4]. Because the lithosphere includes both the crust and the rigid upper mantle, the total lithospheric depth is greatest under massive orogenic belts like the Himalayan Mountains, where the crustal root is deepest and the underlying lithospheric mantle is substantial. In contrast, oceanic lithosphere in the Pacific or desert plains lacks the extreme crustal thickening found in high-altitude mountain ranges.

Sources

1. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 1: BASIC CONCEPTS OF ENVIRONMENT AND ECOLOGY > Lithosphere > p. 10
2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 4: Earths Interior > Lithosphere > p. 54
3. [3] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 3: Interior of the Earth > The Mantle > p. 23
4. [4] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 3: Interior of the Earth > The Crust > p. 22