The three large peninsulas extending off of Europe are the Iberian Peninsula, Italian Peninsula, and the Balkan Peninsula.
<u>Explanation:</u>
The Europe continent is a 'peninsula of peninsulas'. Which means a bigger piece of land covered by 'water on three sides' and is constituted by smaller pieces of land which are also covered by 'water on three sides'.
It is a peninsular landmass that is made up of other subsidiary peninsulas stretching out of the main peninsula.
The European continent is covered by water on three sides both on the northern front and the southern front.
It is covered by water on almost all the sides but is still connected to a larger piece of land.
The three of the major peninsulas in Europe are the 'Iberian Peninsula', 'the Balkan Peninsula' and 'the Italian Peninsula' which are all on the southern side of the European continent.