length

http://www.wikidata.org/prop/direct/P2043

Used as a Predicate in:

Schema Name	Schema Link
UNESCO world heritage site	https://www.wikidata.org/wiki/EntitySchema:E142
submarine communications cable	https://www.wikidata.org/wiki/EntitySchema:E147

Used as an Object in:

Schema Name	Schema Link
UNESCO world heritage site	https://www.wikidata.org/wiki/EntitySchema:E142