Mallard Island is a island located in Contra Costa County, California. It appears on the Honker Bay USGS 7.5-minute topographic quadrangle. The nearest populated place is Chipps, approximately 0.7 miles to the NNE.
Contra Costa County · California
Mallard Island is a island located in Contra Costa County, California. It appears on the Honker Bay USGS 7.5-minute topographic quadrangle. The nearest populated place is Chipps, approximately 0.7 miles to the NNE.