Fortin Toledo combines Chaco War history with conservation interest in the dry Paraguayan Chaco. The area is especially associated with work to protect and breed the Chacoan peccary, a species once thought extinct by science.
It is a low-key but worthwhile excursion from Filadelfia for travelers interested in the Chaco beyond Mennonite settlements. Go with local advice, since distances, heat, and road conditions shape the experience.