ABRUZZO ULTERIORE I. is the most northerly of the three provinces, and has an area of 1283 square miles, with a population in 1871 of 245,684. The western part of the province is very mountainous, the highest crest of the Apennines dividing it from Abruzzo Ulteriore II. The valleys possess a rich soil, well watered by rivulets and brooks in the winter and spring, but these are generally dried up in the summer months. The streams run mostly into the Pescara, which bounds the province towards Abruzzo Citeriore, or into the Tronto, which is the northern boundary. The city of Teramo is the capital of the province.