Item shows ocean floor cross sections at 49 degrees latitude, 48 degrees 45', 48 degrees 35', and 48 degrees 25'. Islands and other geographical features are indicated.
Item is a map showing four proposed boundaries between the United States and British possessions in the Salish Sea region. The explanations of the lines read in part: "[1] Boundary line contemplated by the Treaty as shown by contemporaneous evidence; [2] Boundary line as claimed by the British Commissioner; [3] Boundary line proposed by the British Commissioner as a compromise ( . . . ); [4] Boundary line in accordance with the strict letter of the Treaty ( . . . ). Item also shows soundings, and the "track of steamers plying between Victoria and Fraser river since discovery of gold."
Item is a reproduction of a map of the Strait of Juan de Fuca, including the southern tip of Vancouver Island, the southern Gulf Islands and adjacent mainland, Admiralty Inlet and Puget Sound.