Explanation

Option D is correct: The Siachen Glacier is located in the eastern Karakoram Range, extending along the Saltoro Ridge:

– It lies immediately to the North of the Nubra Valley. Melting ice from the snout of the Siachen Glacier feeds the Nubra River, which flows southward to join the Shyok River (a major tributary of the Indus River).
– Option A is incorrect: It lies to the West of Aksai Chin (across the Line of Actual Control).
– Option B is incorrect: It lies almost directly to the North of Leh.
– Option C is incorrect: It lies to the East of Gilgit and Baltistan.

Therefore, Siachen Glacier is situated to the North of Nubra Valley — Option D.