Covers the basin of the Arantsoro stream, which feeds the River Bidasoa. Covered for the most part by highly natural Atlantic woodland. Most of the woodland consists of Beech trees, although there are also patches of Pedunculate oak, Pyrenean oak and Alder.
This area is a Site of Community Importance (Natura 2000 Network) and a Natural Park.Habitats
Deciduous woodland, mainly Beech.Birds
- Residents: Red kite, Griffon vulture, Northern goshawk, Eurasian sparrowhawk, Common buzzard, Eurasian collared dove, Barn owl, Tawny owl, Common kingfisher, Iberian green woodpecker, Black woodpecker, Great spotted woodpecker, Lesser spotted woodpecker, White wagtail, Grey wagtail, Dipper, Wren, Dunnock, Robin, Black redstart, Blackbird, Song thrush, Mistle thrush, Blackcap, Firecrest, Long-tailed tit, Marsh tit, Crested tit, Coal tit, Blue tit, Great tit, European nuthatch, Eurasian treecreeper, Short-toed treecreeper, Eurasian jay, Magpie, Carrion crow, Common raven, Common starling, House sparrow, Common chaffinch, European serin, Greenfinch, Goldfinch, Common bullfinch, Yellowhammer, Cirl bunting, Rock bunting.
- Summer visitors: European honey-buzzard, Black kite, Egyptian vulture, Short-toed eagle, Hen harrier, Hobby, Common cuckoo, European nightjar, Common swift, House martin, Barn swallow, Tree pipit, Melodious warbler, Garden warbler, Common whitethroat, Iberian chiffchaff, Spotted flycatcher, Red-backed shrike.
- Winter visitors: Woodcock, Common woodpigeon, Fieldfare, Redwing, Common chiffchaff, Goldcrest, Siskin, Hawfinch.
- Passage migrants: Booted eagle, Common redstart, Willow warbler, Golden oriole, Pied flycatcher.Recommended observation points
- Iturburua footpath (3 km.)