# Twentyone Hill

Twentyone Hill is a summit in [Garfield Township](https://ontology.bommaritollc.com/id/01a0ca47-7011-744b-a593-43cd8e1e9d10), [Kalkaska County](https://ontology.bommaritollc.com/id/01a0ca47-5dbc-76a7-9cd6-a573389e3d9a), [Michigan](https://ontology.bommaritollc.com/id/01a0ca47-57ff-7219-9e2f-cdc1b39bd0fa), in the [Silver Creek-Manistee River (HUC10 0406010302)](https://ontology.bommaritollc.com/id/01a0de92-1de1-7326-b5a0-8a0055867152) watershed.

IRI: <https://ontology.bommaritollc.com/id/01a0ddfe-cd30-70d6-86bc-2fbd0856f089>

Within: [Michigan](https://ontology.bommaritollc.com/id/01a0ca47-57ff-7219-9e2f-cdc1b39bd0fa) › [Kalkaska County](https://ontology.bommaritollc.com/id/01a0ca47-5dbc-76a7-9cd6-a573389e3d9a) › [Garfield Township](https://ontology.bommaritollc.com/id/01a0ca47-7011-744b-a593-43cd8e1e9d10)

Type: [geo:Feature](http://www.opengis.net/ont/geosparql#Feature), [schema:Mountain](https://schema.org/Mountain), [schema:Place](https://schema.org/Place)

Location: 44.56716, -85.15882 (box -85.15882, 44.56716, -85.15882, 44.56716; west, south, east, north)

- `adms:identifier`: [gnis 1615226](https://ontology.bommaritollc.com/id/01a0ddfe-cd30-70d6-86bc-2fc6f3652c14)
- `dcterms:type`: [summit](https://ontology.bommaritollc.com/vocab/geo/gnisSummit)
- `geo:hasDefaultGeometry`: [point of Twentyone Hill](https://ontology.bommaritollc.com/id/01a0ddff-0899-759d-b3c5-cce2adb6f6ce)
- `geo:hasGeometry`: [point of Twentyone Hill](https://ontology.bommaritollc.com/id/01a0ddff-0899-759d-b3c5-cce2adb6f6ce)
- **in watershed** (`bcgeo:inWatershed`): [Silver Creek-Manistee River (HUC10 0406010302)](https://ontology.bommaritollc.com/id/01a0de92-1de1-7326-b5a0-8a0055867152)
- `prov:wasDerivedFrom`:
  - [evidence from https://prd-tnm.s3.amazonaws.com/StagedProducts/GeographicNames/DomesticNames/DomesticNames\_MI\_Text.zip](https://ontology.bommaritollc.com/id/01a0ddfe-cd30-70d6-86bc-2fbc8b442d21)
  - [evidence from https://3dhp.nationalmap.gov/arcgis/rest/services/usgs\_3dhp\_all/FeatureServer](https://ontology.bommaritollc.com/id/01a0de32-5f4f-70e5-927c-12085c7c5771)
  - [evidence from https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer](https://ontology.bommaritollc.com/id/01a0de92-1786-7643-948f-cfc7e602bd9b)
- `schema:containedInPlace`:
  - [Kalkaska County](https://ontology.bommaritollc.com/id/01a0ca47-5dbc-76a7-9cd6-a573389e3d9a)
  - [Garfield Township](https://ontology.bommaritollc.com/id/01a0ca47-7011-744b-a593-43cd8e1e9d10)
- `skos:prefLabel`: Twentyone Hill

## Elsewhere

- [Wikidata Q33152542](https://www.wikidata.org/wiki/Q33152542) (proposed match (exactMatch))
- [USGS GNIS 1615226](https://edits.nationalmap.gov/apps/gaz-domestic/public/summary/1615226) (gnis)
- [OpenStreetMap](https://www.openstreetmap.org/?mlat=44.56716&mlon=-85.15882#map=14/44.56716/-85.15882) (44.56716, -85.15882)
- [Google Maps](https://www.google.com/maps/search/?api=1&query=44.56716,-85.15882)
- [Source](https://prd-tnm.s3.amazonaws.com/StagedProducts/GeographicNames/DomesticNames/DomesticNames_MI_Text.zip) (prd-tnm.s3.amazonaws.com)
- [Source](https://3dhp.nationalmap.gov/arcgis/rest/services/usgs_3dhp_all/FeatureServer) (3dhp.nationalmap.gov)
- [Source](https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer) (hydro.nationalmap.gov)

## Pointing here

- Mappings (1; `owl:annotatedSource`):
  - [exactMatch http://www.wikidata.org/entity/Q33152542 (proposed)](https://ontology.bommaritollc.com/id/01a0ddff-77ef-7789-9e75-5110a48b4326)

---
Also as: [Turtle](https://ontology.bommaritollc.com/id/01a0ddfe-cd30-70d6-86bc-2fbd0856f089.ttl), [JSON-LD](https://ontology.bommaritollc.com/id/01a0ddfe-cd30-70d6-86bc-2fbd0856f089.jsonld), [N-Triples](https://ontology.bommaritollc.com/id/01a0ddfe-cd30-70d6-86bc-2fbd0856f089.nt), [HTML](https://ontology.bommaritollc.com/id/01a0ddfe-cd30-70d6-86bc-2fbd0856f089)
Cite as: Twentyone Hill. bc-ontology, release 0.1.0-rc12, 2026-09-27. https://ontology.bommaritollc.com/id/01a0ddfe-cd30-70d6-86bc-2fbd0856f089
Release 0.1.0-rc12, graph hash a20f66b983549f220c6f061b7e40233771a06aa47a0c0aede95a2a57ee2e9553.