Maison Derwent Bamboo Pyjama Sets name is inspired by the Derwent River – the primary water source to Hobart and the venue for the Sydney-to-Hobart Yacht Race. The origin of this river is in one of the most beautiful places in Tasmania – the Cradle Mountain-Lake St Clair National Park. Whales can be found in its waters in winter and spring when their migration takes place.