ðɪ ˈaɪlənd hɐz ɐ lˈɛŋθ ʌv tˈuːhˈʌndɹɪd ˈeɪɾi ˈɛm ænd ɐ mˈæksɪməm wˈɪtθ ʌv sˈɪksti ˈɛm. ʃˈɛpɚtən lˈɑːk ɪz tˈuːhˈʌndɹɪd sˈɛvənti ˈɛm dˈaʊnstɹiːm ænd tˈuː ˈʌðɚ tʃˈænəlz lˈiːdɪŋ tə wˈɪɹz daɪvˈɜːdʒ ˈɔf ˈæftɚ ðɪ ˈaɪlənd tʊ ɪts sˈaʊθiːst.
The island has a length of 280 m and a maximum width of 60 m. Shepperton Lock is 270 m downstream and two other channels leading to weirs diverge off after the island to its southeast.