Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Tower of London' has mentioned 'River' in the following places:
Occurrence Sentence Text Source
[21] Construction of Wakefield and Lanthorn Towers xe2x80x93 located at the corners of the innermost ward's wall along the river xe2x80x93 began around 1220.
The dock was covered with arrowslits in case of an attack on the castle from the River; there was also a portcullis at the entrance to control who entered.
New creations included a new defensive perimeter, studded with towers, while on the west, north, and east sides, where the wall was not defended by the river, a defensive ditch was dug.
Such development could limit the ability to perceive the Tower as being slightly apart from the City, or have an adverse impact on its skyline as viewed from the river.