he mountainous system has many interesting characteristics, it has craggier  towards the Orient, it shows scarce narrow passes and  narrow brooks with their walls very close and sinuous.
The oriental mountain range has branches with a direction generally towards NorthEast - SouthEast, and these branches go to the Amazonas.
    A part of his orography is in relation with the hydrography. Declives and branches have a direction towards the Oriental Provinces and towards the Littoral Region. They have a big difference, because the first are prolongates and soft; and the second are short and brusque.
    The Andean mountain range is cover of snow, and it is formed by: Antizana (north), Sangay (south). We can describe some elevations like:  a branch of Oriental mountain range, with a direction NorthEast of Tulcán, it forms the road for: Aguarico river and San Miguel de Sucumbios, and after it'll form the DIVORTIUM ACUARUM between the rivers Putumayo and Napo.
    Towards the South of Hermoso hill, it has another big branch, where we can see the Jorobado hill.  This hill forms to small branches of  Pastaza, Agoyán and then it emits more branch that separates rivers like: Napo-Curaray, Curaray-Bobonaza, Tigre-Pastaza, and the DIVORTIUM ACUARUM Bobonaza-Pastaza.
    Each point receives a particular name like the Abitagua for example: it is separated by Llanganates and it loses to 2 Km. of Mera, and it serves of  DIVORTIUM ACUARUM between  the Allpa-yacu and the Puyo.
    Altar hill forms small mountain ranges like: Condorasto and Guamboyas. These separate to the waters that go to the rivers Palora and Pastaza.
 


 
Principals  orographics zones
 
Names
Size
 
5304 m.
5756 m.
  • Antzu
543 m.
  • Arapicos
914 m.
  • Archidona
609 m.
  • Baños
1829 m.
5791 m.
  • Canelos
515 m.
  • Casha Urcu
1425 m.
  • Coca (river)
259 m.
5882 m.
  • Curaray (High-River)
553 m.
  • Chambo-Patate (confluence) 
1920 m.
  • Divortium Acuarum (Arajuno-Curaray)
305 m.
  • Galeras
1646 m.
  • Guacamayos
2623  m.
  • Guamaní
4072 m.
  • Macas
1091 m.
  • Mera
1158 m.
457 m.
  • Palugillo (hacienda)
2881 m.
  • Papallacta
3150 m.
  • Pastaza (confluence Chambo-Patate)
1920 m.
  • Puyo
975 m.
  • Quijos 
1784 m.
  • Reventador (volcano in activity)
1829 m.
  • Sangay (volcano in activity)
5323 m.
  • Sumaco
3862 m.
  • Tena
518 m.
  • Topo
1219 m.
5029 m.
  • Villano
530 m.
 
* EXPLICATION
 
 
 Elevations between 5000 and 6000 meters

 

Elevations between 3000 and 5000 meters

 
Elevations between 1000 and 2000 meters
 
 

 Elevations between 0 and 1000 meters

 
Rivers that are limiting with othres provinces
 

 
 
 
 
Characteristics of the Oriental mountain range
 
  • The Oriental mountain range is directed to North and South.
    •
  • Upano's depression separates the Oriental mountain range from the Sierra of Cutucú, and it has his similar to North in the depression Yla, Archidona, Jondachi.
    •
  • Sierra of Cutucú continues towrads the South of the Cóndor mountain range.
    •  The big oriental's plains are:

     
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