Occurrence of Attributes in Original Text

The text related to the cultural heritage 'The Slate Landscape of Northwest Wales' has mentioned 'River' in the following places:
Occurrence Sentence Text Source
This helped expansion at the Blaenau Ffestiniog quarries,[29] which had previously had to cart the slate to Maentwrog to be loaded onto small boats and taken down the River Dwyryd to the estuary, where it was transferred to larger vessels.
[27] The Corris Railway opened as the horse-worked Corris, Machynlleth & River Dovey Tramroad in 1859, connecting the slate quarries around Corris and Aberllefenni with wharves on the estuary of the River Dyfi.
[85] The Braichgoch slate mines at Corris have been converted into a tourist attraction named "King Arthur's Labyrinth" where visitors are taken underground by boat along a subterranean river.