An interesting niche within the whole folk-metal sub-genre that I'm finding myself rather enjoying atm.

Some samples:

Tenochtitlan

Kukulcan

Guahaihoque

Arraigo

Chaska

I should note also that Tenochtitlan is actually a Russian band, but they fit in with the sound so "oh well" xp



Also, here are some other bands (mostly from South America) to look up if any of those interested you:

Yaotl Mictlan
EK
Aztra
Muluc Pax
Folkheim
Gnosis
Wangelen
Soul of Honor
Toccata Magna
Kranium
Yanaconas
Xolotl
Raxa
Senmuth (some stuff, but the guy does all kinds of things and has released 68 full length albums in the past 6 years, so... yeah)