Milam Glacier Trek
This challenging eight-day, 118km trek to the massive Milam Glacier (3450m) is reached along an ancient trade route to Tibet that was closed in 1962 following the war between India and China. It passes through magnificent rugged country to the east of Nanda Devi (7816m) and along the sometimes spectacular gorges of the river, Gori Ganga. You can also take a popular but tough side trip to Nanda Devi East base camp, adding another 32km or three days.
Free permits (passport required) are available from the District Magistrate in Munsyari. You will also need a tent and your own food supplies, as villages on the route may be deserted. The base for this excursion is the spectacularly located village of Munsyari, where a guide, cook and porters can be hired and package treks can be arranged through Nanda Devi Tour N Trek. Otherwise KMVN Parvat Tours in Nainital can organise all-inclusive eight-day treks (per day from ₹2200). These are best arranged at KMVN but the KMVN Rest House in Munsyari should be able to set you up too.
Less travelled but equally (or more) stunning treks include the Begini/Dunagiri route north of Joshimath and the Panchachuli East/Chota Kailash route, north of Dharchula.