# Madison Gap

Madison Gap is a swamp in [Eagle Harbor Township](https://ontology.bommaritollc.com/id/01a0ca47-6e5a-71b6-9848-23ba888081e4), [Keweenaw County](https://ontology.bommaritollc.com/id/01a0ca47-5d2f-7501-b2ba-1fe0d1e4fc6a), [Michigan](https://ontology.bommaritollc.com/id/01a0ca47-57ff-7219-9e2f-cdc1b39bd0fa), in the [Montreal River-Frontal Lake Superior (HUC10 0402010305)](https://ontology.bommaritollc.com/id/01a0de92-1c3c-7128-b86f-05eb41187e92) watershed.

IRI: <https://ontology.bommaritollc.com/id/01a0ddfe-bdca-76c5-8fdb-ed6b66ecf46a>

Within: [Michigan](https://ontology.bommaritollc.com/id/01a0ca47-57ff-7219-9e2f-cdc1b39bd0fa) › [Keweenaw County](https://ontology.bommaritollc.com/id/01a0ca47-5d2f-7501-b2ba-1fe0d1e4fc6a) › [Eagle Harbor Township](https://ontology.bommaritollc.com/id/01a0ca47-6e5a-71b6-9848-23ba888081e4)

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

Location: 47.42158, -88.15483 (box -88.15483, 47.42158, -88.15483, 47.42158; west, south, east, north)

- `adms:identifier`: [gnis 631310](https://ontology.bommaritollc.com/id/01a0ddfe-bdcb-7451-aa87-ab7ec692f611)
- `dcterms:type`: [swamp](https://ontology.bommaritollc.com/vocab/geo/gnisSwamp)
- `geo:hasDefaultGeometry`: [point of Madison Gap](https://ontology.bommaritollc.com/id/01a0ddfe-f541-771b-aea6-9936ddea5992)
- `geo:hasGeometry`: [point of Madison Gap](https://ontology.bommaritollc.com/id/01a0ddfe-f541-771b-aea6-9936ddea5992)
- **in watershed** (`bcgeo:inWatershed`): [Montreal River-Frontal Lake Superior (HUC10 0402010305)](https://ontology.bommaritollc.com/id/01a0de92-1c3c-7128-b86f-05eb41187e92)
- `prov:wasDerivedFrom`:
  - [evidence from https://prd-tnm.s3.amazonaws.com/StagedProducts/GeographicNames/DomesticNames/DomesticNames\_MI\_Text.zip](https://ontology.bommaritollc.com/id/01a0ddfe-bdca-76c5-8fdb-ed6aa8a781e4)
  - [evidence from https://3dhp.nationalmap.gov/arcgis/rest/services/usgs\_3dhp\_all/FeatureServer](https://ontology.bommaritollc.com/id/01a0de32-5397-7141-82e3-90f323931287)
  - [evidence from https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer](https://ontology.bommaritollc.com/id/01a0de92-1586-7039-90cd-868a60007357)
- `schema:containedInPlace`:
  - [Keweenaw County](https://ontology.bommaritollc.com/id/01a0ca47-5d2f-7501-b2ba-1fe0d1e4fc6a)
  - [Eagle Harbor Township](https://ontology.bommaritollc.com/id/01a0ca47-6e5a-71b6-9848-23ba888081e4)
- `skos:prefLabel`: Madison Gap

## Elsewhere

- [Wikidata Q33176007](https://www.wikidata.org/wiki/Q33176007) (proposed match (exactMatch))
- [USGS GNIS 631310](https://edits.nationalmap.gov/apps/gaz-domestic/public/summary/631310) (gnis)
- [OpenStreetMap](https://www.openstreetmap.org/?mlat=47.42158&mlon=-88.15483#map=14/47.42158/-88.15483) (47.42158, -88.15483)
- [Google Maps](https://www.google.com/maps/search/?api=1&query=47.42158,-88.15483)
- [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/Q33176007 (proposed)](https://ontology.bommaritollc.com/id/01a0ddff-75f8-775d-9df1-f65ef701ae46)

---
Also as: [Turtle](https://ontology.bommaritollc.com/id/01a0ddfe-bdca-76c5-8fdb-ed6b66ecf46a.ttl), [JSON-LD](https://ontology.bommaritollc.com/id/01a0ddfe-bdca-76c5-8fdb-ed6b66ecf46a.jsonld), [N-Triples](https://ontology.bommaritollc.com/id/01a0ddfe-bdca-76c5-8fdb-ed6b66ecf46a.nt), [HTML](https://ontology.bommaritollc.com/id/01a0ddfe-bdca-76c5-8fdb-ed6b66ecf46a)
Cite as: Madison Gap. bc-ontology, release 0.1.0-rc12, 2026-09-27. https://ontology.bommaritollc.com/id/01a0ddfe-bdca-76c5-8fdb-ed6b66ecf46a
Release 0.1.0-rc12, graph hash a20f66b983549f220c6f061b7e40233771a06aa47a0c0aede95a2a57ee2e9553.