Correct Option (D):
Siachen Glacier is situated to the north of the Nubra Valley.
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Siachen Glacier: It is located in the eastern Karakoram Range in the Himalayas and lies north of the Nubra Valley. It is one of the highest and coldest battlefields in the world.
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Nubra Valley: This valley lies to the south of the Siachen Glacier and is drained by the Nubra River, a tributary of the Shyok River.
Incorrect Options:
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East of Aksai Chin: Siachen Glacier lies to the west of Aksai Chin, not east.
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East of Leh: Siachen is located to the north of Leh, not east.
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North of Gilgit: Gilgit lies to the west of Siachen Glacier, so this is incorrect.