Sumaco is a symmetrical, isolated stratovolcano, that is set off from the main Ecuador volcanic axis.

Sumaco is heavily forested and contains a small cone in its broad summit crater.

[1] Sumaco is isolated from the Cordillera Oriental by the lowland valley of the Cosanga and Quijos Rivers.

[3] There are also a number of endemic animals, including toad Osornophryne sumacoensis only known from the eastern slopes of Sumaco,[4][5] and robber frog Pristimantis ernesti only known from the summit of Sumaco.

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