The exact location of the mountain is unknown.
Fauna and Flora
The mountain contained a unique kind of anesthetic mushrooms that resulted in strong intoxication if inhaled or consumed, causing the consumer to process incorrectly, which could result in delirium.
As Natsu Dragneel and Happy are camping in the Mount Altana during their training session during Fairy Tail's dissolution, they meet a guild who had stolen Happy's fish. A drugged Natsu gets enraged and quickly defeats them with the greatest ease, destroying nearly the whole mountain.
During Natsu's fight with Mount Altana Guild, the drugged Fire Dragon Slayer knocks out the four Mages with his Fire Dragon's Wing Attack, causing a massive explosion resulting in the thaw of the mountain completely.