Peel Island (formerly known as Montague Island or the Gridiron) is one of the three islands of Coniston Water in the English Lake District, Cumbria. The two others are Fir Island (which is connected to the shore unless the water is particularly high) and Oak Island. It is most famous for being one of the inspirations for Arthur Ransome's Wild Cat Island. Today, it is a popular tourist destination, and belongs to the National Trust.