51°23′40″N 0°19′55″W / 51.39444°N 0.33194°W Three river islands (aits) form a linear group, close to the junction of the two main old streets of Thames Ditton village, in the River Thames in a corner of modern Surrey, on the Kingston reach above Teddington Lock. Thames Ditton Island, the dominant ait, is 350 yards (320 m) long and has 48 houses with gardens (and moorings); Boyle Farm Island has one house; Swan Island, between the two, is the smallest.