Rio Arriba County is a district of New Mexico.
Boundaries: United States Census Bureau, MAF/TIGER Database (https://www.census.gov/geographies/mapping-files/time-series/geo/carto-boundary-file.html) via geoBoundaries, public domain
Nothing has been written about Rio Arriba County here, and neither Wikipedia nor Wikivoyage has an article we could draw one from. If you know the place, that makes you a better source than anything we have. Tell us what is worth knowing and where you got it.
We show Tierra Amarilla as the capital of Rio Arriba County. If that is wrong, tell us what it should be and where you read it.
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