The Guugu Yimithirr, also spelt Gugu Yimithirr and also known as Kokoimudji, are an Aboriginal Australian people of Far North Queensland, many of whom today live at Hopevale, which is the administrative centre of Hopevale Shire. At the 2011 census, Hopevale had a population of 1,005 people. It is about 46 kilometres (29 mi) from Cooktown by road. It is also the name of their language. They were both a coastal and inland people, the former clans referring to themselves as a "saltwater people".

Cooktown is a coastal town and locality in the Shire of Cook, Queensland, Australia. Cooktown is at the mouth of the Endeavour River, on Cape York Peninsula in Far North Queensland where James Cook beached his ship, the Endeavour, for repairs in 1770. Both the town and Mount Cook which rises up behind the town were named after James Cook.