In 1910 Miuçalhas gallegas was published; drawing attention to various aspects of Galician studies, it contained a brief discourse on the linguistic boundary between Fala and Galician, corresponding to Ribadavia, Ferreiros and San Miguel de Lobios in Ourense, much of Hermisende and Zamora—although the last of these is, strictly speaking, a separated or transmontane Fala.
The Penedo is located on the border between the village of Moimenta in the municipality of Vinhais, the municipality of A Mezquita in province of Ourense (Autonomous Community of Galicia) and the municipality of Hermisende in Senabria comarca of the province of Zamora (Autonomous Community of Castile and León).