However , older definitions , and many older maps , place its start a few miles up the Goyt ; for example the 1911 Encyclopaedia Britannica states `` It is formed by the junction of the Goyt and the Etherow a short distance below Marple in Cheshire on the first-named stream . '' However , older definitions , and many older maps , place its start a few miles up the Goyt ; for example the 1911 Encyclopedia Britannica states `` It is formed by the junction of the Goyt and the Etherow a short distance below Marple in Cheshire on the first-named stream . ''