Siachen Glacier is situated to the

The Nubra Valley serves as the gateway to the strategically important Siachen Glacier and Karakoram Pass.

The Karakoram Pass, located to the northwest, connects the valley with Xinjiang, China. This area was historically part of the ancient Silk Route, facilitating trade between China and the Middle East.

The Nubra River, a tributary of the Shyok River (part of the Indus River system), originates from the Siachen Glacier, which is the second-longest non-polar glacier in the world.

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

Hence, option (d) is the correct answer.