The Monte Emilius Group, located at the center of Valle d'Aosta, covers a vaguely trapezoidal area thus delimited:
- From the north by the main valley, between the Villages of Saint Marcel and Aymavilles. The Dora Baltea River runs through the valley.
- From the south and the west by Vallone dell'Urtier (vallone means hanging valley) and Valle di Cogne. The Grand Eyvia creek runs through the latter and, in Aymavilles, flows into Dora Baltea.
- From the east by Vallone di Clavalitè, which also forms the western boundary of the group known as "Mont Glacier, Mont Avic e Rosa dei Banchi".
- From the southeast, very briefly, by Vallone di Champorcher, in the stretch of the ridge between Col Pontonnet and Finestra di Champorcher.
The group includes important summits like Punta Tersiva (3.515m)
and Punta Garin (3.451m),
but its center is Monte Emilius (3.559m),
from which several ranges depart to form the watersheds of hanging valleys, studded with incomparably beautiful lakes and inhabited by chamois, ibex, fox, eagles, and marmots. (This fauna often comes from the nearby Parks of Gran Paradiso and Mont Avic)
The hanging valleys that go approximately from north to south along the sides of the Central Valley, and originate directly from Monte Emilius, are (from east to west):
- Vallone di Laures (or Brissogne) under the East face of Monte Emilius.
- Vallone di Arpisson, at whose head is the North face of Emilius.
- Vallone di Comboè, which, after a cliff, suddenly changes direction (from north-south to east-west) and-going around the western spur that descends from the Emilius Summit to Petit Emilius and Mont Ross de Comboè--forms Comba di Arbolle (or Arbole).
This hanging valley provides the access to the standard route to Monte Emilius, which attains the summit running along the Tre Cappuccini ridge from the namesake col, which takes its name from three characteristic gendarmes.
To the west of the aforementioned hanging valleys, the Monte Emilius Group includes the vast Conca di Pila (Pila Basin), a popular ski resort in winter, but less crowded in summer, while to the east, the last valley entirely belonging to the Emilius Group is Vallone di Saint Marcel, which also goes from north to south, and is connected by the namesake pass (also known as Colle Coronas) to Vallone di Grauson.
Valle di Cogne, which makes up the long western and southern boundary of the group, terminates with Vallone dell'Urtier, where the namesake creek forms the magnificent Lillaz Falls-a great attraction for tourists in summer and ice climbers in winter. On the sides of Valle di Cogne, two hanging valleys reach deep into the group, merging at Punta Garin; they are:
- Vallone di Arpisson (di Cogne) or Pian Bessey
- The long and vast Vallone di Grauson, mostly above 2.400m of elevation.
Its branch, named Vallone di Lussert, extends northwards, that is towards the center of the group. At the eastern head of its main branch, more exactly named Vallone di Doreire, rises the unmistakeable outline of Tersiva.
Panoramic view from the summit of Punta Tersiva 3.515 m (images by Gino Bolfo, realization by livioz)