DescriptionGlaciers de Tronchey and Pra Sec are on Grandes Jorasses south-east side glacier. Both are small and not accessible. Tronchey glacier can be seen as Pra Sec upper glacier.
They are mountain slope glacier.
Grandes Jorasses 4208m
MeasurementsSurface: 0,2 km2 both
Length: 1 km + 0,8 km
Thickness: 0m < e < 20m
Altitude: 2400m < a < 3300m