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Welcome to the TopoQuest Map Viewer! Seal Island Channel, CA is a channel located in Contra Costa County at N38.05492° W122.04469° (NAD83). This is the nearest place in the USGS place names database to the center of the map view below. Look below the map view for a list of other places and locations that are visible within this map view. If you need to locate a landmark or feature, you can search for its location on our Find Places page. If you need to locate a specific USGS topographic map, try our Find Maps page. |