River Blackwater (Q7337149)

matcher place: Berkshire (relation 88070), Borough of Wokingham (relation 114311)
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English Wikipedia categories: Loddon catchment, Rivers of Berkshire, Rivers of Hampshire, Rivers of Surrey, Sites of Special Scientific Interest in Berkshire, Sites of Special Scientific Interest in Hampshire, Sites of Special Scientific Interest notified in 1987

Overpass query: show query – Overpass Turbo

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    node(around:1000,51.38500,-0.95800)[waterway][~"^(addr:housenumber|.*name.*)$"~".",i];
    way(around:1000,51.38500,-0.95800)[waterway][~"^(addr:housenumber|.*name.*)$"~".",i];
    rel(around:1000,51.38500,-0.95800)[waterway][~"^(addr:housenumber|.*name.*)$"~".",i];
    node(around:1000,51.38500,-0.95800)[leisure=fishing][~"^(addr:housenumber|.*name.*)$"~".",i];
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    node(around:1000,51.38500,-0.95800)[natural=water][name];
    way(around:1000,51.38500,-0.95800)[natural=water][name];
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out center tags;

Summary from English Wikipedia (enwiki)

The River Blackwater is a tributary of the Loddon in England and sub-tributary of the Thames. It rises at two springs in Rowhill Nature Reserve between Aldershot, Hampshire and Farnham, Surrey. It curves a course north then west to join the Loddon in Swallowfield civil parish, central Berkshire. Part of the river splits Hampshire from Surrey; a smaller part does so as to Hampshire and Berkshire.

Wikidata location: 51.3850, -0.9580 view on OSM or edit on OSM

matches

found a single match candidate

way: Blackwater River (OSM), 30 metres from Wikidata [show tags]

name: Blackwater River
waterway: river
wikidata: Q7337149

wikidata match: Q7337149

Search criteria from Wikidata

view with query.wikidata.org

body of water (Q15324)	natural=water
watercourse (Q355304)	waterway
river (Q4022)	waterway=river, leisure=fishing, type=waterway
stream (Q47521)	waterway

Search criteria from categories

Rivers of Berkshire	type=waterway
Rivers of Hampshire	type=waterway
Rivers of Surrey	type=waterway