Biasca has an area, as of 1997, of 59.13 square kilometers (22.83 sq mi). Of this area, 2.86 km2 (1.10 sq mi) or 4.8% is used for agricultural purposes, while 26.6 km2 (10.3 sq mi) or 45.0% is forested. Of the rest of the land, 2.92 km2 (1.13 sq mi) or 4.9% is settled (buildings or roads), 1.19 km2 (0.46 sq mi) or 2.0% is either rivers or lakes and 21.7 km2 (8.4 sq mi) or 36.7% is unproductive land.
In 948, the Bishop of Vercelli donated the area around Biasca to the Bishop of Milan. This led to the spiritual and secular domination of the valley north of Bellinzona. During the Bishop's conflicts with the Holy Roman Empire over the Lombardy provinces, Biasca and the surrounding region suffered from armies marching through the valley.[
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