The islands are divided among the 8 in Piedmont, 2 in Switzerland, and 2 in Lombardy, for a total of 12.
Surface area: 212 km²: 80% in Italy – 20% in Switzerland
Length: 64.37 km
Width: 5 km
Perimeter: 170 km
Maximum depth: 372 m
Between Stresa and Verbania lies the Borromean archipelago: Isola Madre (the largest in the lake basin), Isola Bella, and Isola Superiore dei Pescatori (also known simply as Isola dei Pescatori or Isola Superiore).
Opposite the Swiss town of Ronco sopra Ascona are the two Brissago Islands, the larger of which is home to a botanical garden. They are known as Isola di San Pancrazio (or Isola Grande) and Isola di Sant’Apollinare (or Isolino).
Castelli di Cannero:
Off the coast of Cannero Riviera, there are three emerged rocks known as Castelli di Cannero:
Lastly, we should mention:
Flora: The mild climate promotes the growth of lemons, olive trees, and laurels. Camellias, azaleas, rhododendrons, and magnolias thrive and can be admired in the numerous and splendid gardens that line the Piedmontese coast.
Fauna: The lake is home to two species of whitefish, the bleak, and less commonly, the lavaret. Other fish species found in the lake include the vendace, perch, pike, chub, roach, catfish, eels, bleak, and trout. The lake also hosts various nesting species of waterbirds and serves as an important corridor and stopover for migratory birds. Some examples include the great crested grebe, mute swan, tufted duck, seagulls, cormorants, and ducks.