Match: Q4784961 + way/182801066

Wikidata: Arbuthnot Lake (Q4784961)
OSM: Arbuthnet Lake (way 182801066)
matcher place: Whatcom County (relation 1153762), Mount Baker-Snoqualmie National Forest (relation 1399218), Mount Baker Wilderness (relation 6116357)
Wikidata and OSM exact location match
Wikimedia Commons
English Wikipedia categories: Lakes of Washington (state), Lakes of Whatcom County, Washington, Mount Baker-Snoqualmie National Forest, Whatcom County, Washington, geography stubs
Tags from Wikidata and Wikipedia: natural=lake, natural=water, water=lake, water=pond

Wikidata location: 48.8592, -121.7230 view on OSM

OSM tag name=Arbuthnet Lake matches Arbuthnet Lake in these Wikidata fields:

Lakes of Washington (state)	water=lake, water=pond, natural=lake
Lakes of Whatcom County, Washington	water=lake, water=pond, natural=lake