Charts. Colombo Harbor, Ceylon, west coast, Indian Ocean, from British survey in 1906, with corrections from Harbor Engineers plan of 1928, topography from Ceylon Government survey; chart 2437. Scale 2,000 yds.=9.6 in., natural scale 1:7,500. Wasbington, Hydrographic Office, published June 1910, 8th edition, Dec. 1935, corrected through Notice to mariners 1, Jan. 1, 1936. 33.3×25.9 in.