Abruzzi, also called Abruzzo, was a hill town in the Middle Ages. It was an agricultural economy, relying on livestock, farming, shepherds, etc. This is where Euthansia is wandering after her younger brother dies: 

"You have not studied the histories of ancient times, and perhaps know not the life that breathes in them; a soul of beauty and wisdom which had penetrated my heart of hearts. When I descended the hills of Abruzzi, and first saw the Tiber rolling its tranquil waters glistening under the morning sun; I wept" (149).

I think Euthanasia's habit of being out in the nature shows her alliance to peace and to her people. She dwells where they dwell, and even seeks refuge and solace in the public place of nature -- rather than in a private garden or in Valperga. Euthansia's love for her people and her land provides a stark contrast to a much earlier passage where Guinigi and Castruccio discussed the lives of peasants:

"Castruccio listened impatiently, and cried: -- 'Yet who would not rather be a knight, than one of those peasants, whose minds are as groveling as their occupations?'

'That would not I,' replied Guinigi fervently; 'how must the human mind be distorted, which can delight in that which is ill, in preference to the cultivation of the earth, and the contemplation of its loveliness!'" (81)