Hi, I was able to find all but one fragment in the game. Does someone know where is the last one?

Fragments that I've found:
2 in the main area
1 in torch puzzle area
1 in path tiles puzzle area
1 in lamps on trees puzzle area
2 in gates puzzle area (1 behind a button wall and other near the fences)

To not spoil too much, typing just the area where I can locate the last one would be very appreciated!