This unique nautical chart is made from Baltic Birch wood, which is carved to create a three-dimensional chart. Features Cape Cod and the Islands. The Bathymetric Chart is labeled with ocean depths, shoal names, areas of Nantucket, Cape Cod, and Martha's Vineyard, and more. The chart is created with the help of a professional cartographer to assure accuracy. Check the photos to see the level of detail for various depths. Each chart is framed in dark, solid wood. Measures 24.5 x 31. A chart with only Nantucket and the surrounding area is also available.