Despite Castiglione's popularity as a holiday destination, the town's natural surroundings - including the sea, marshes and pinewoods typical of the Maremma area - have been meticulously preserved and are today forming protected natural reserves. Notably, in 2015 Castiglione's sea was nominated as Italy's most beautiful by the national non-governmental environmentalist organisation Legambiente, which not only praised the town's seawater cleanliness but also its environmental efforts and efficient recycling.[3]