Bois des Îles, "wood of the islands", was created by Ernest Beaux, the perfumer behind N°5. Chanel's history dates it to 1928 and calls it one of the first woody oriental fragrances in the history of women's perfume; the house has also described it as the first woody fragrance for women. Wikipedia gives its release as 1926.
Its name reflects the 1920s taste for exoticism and travel. The house identifies accords of ylang-ylang and sandalwood at its heart, and Wikipedia lists sandalwood, vetiver, tonka bean, vanilla, ylang-ylang, iris, coriander, rose, jasmine and aldehydes among its notes.
Like several of Beaux's early Chanel perfumes, Bois des Îles was reissued in 2007 as part of Les Exclusifs de Chanel, sold only in Chanel boutiques.