As per glacial lake outburst flood (GLOF) is a release of meltwater which can be either from a moraine- or ice-dam glacial lake due to a dam failure. According to Britannica, a moraine can be referred to an accumulation of rock debris (till) carried or deposited by a glacier. GLOFs have three main features: -They involve -They tend to be -They result in What is Nanda Devi glacier? The Nanda Devi glacier forms part of the second-highest mountain in India -- the Nanda Devi mountain. While it the second-highest after Kangchenjunga, it is the highest mountain located entirely within the country as Kangchenjunga lies on the border of India and Nepal.