Lithograph of the construction works of the Port of Bilbao. The map shows the state of the works in the Bilbao harbor on June 30, 1899. Both the municipalities and various areas of the Bilbao harbor are detailed. Additionally, the following text can be read:
"DEMONSTRATIVE MAP OF THE STATE OF THE PORT WORKS UNDER CONSTRUCTION IN THE BILBAO HARBOR ON JUNE 30, 1899.// NOTE. The contour lines indicating the depths are the result of the detailed sounding conducted in July and August 1892, with parallel transverse profiles from coast to coast at 60-meter intervals, alongside intermediate ones on the western coast and at the river mouth. These latter profiles were rectified in the month of June 1896.// All soundings are referenced to the equinoctial low-water mark of September 27, 1878, which serves as the reference plane."
Following this note, the scale is specified, and at the bottom are the date of creation of the map and the signature of the chief engineer, Evaristo de Churruca.
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