Map showing the Nigerian port of Lagos and the Bay of Benin, and international, intercolonial or mandate, provincial and district boundaries, with dual carriage-railways, single carriage railways: standard gauge, narrow gauge, metered tracks, narrow tracks, roads and ways for motor traffic, heavy duty roads, light duty roads, nature paths, passable all year round, passable only in dry weather, roads under construction, other tracks paths or explorers routes, telegraph lines along roads, telegraph lines, towns of 1st, 2nd, 3rd, 4th and 5th importance, provincial and district capitals, bridges, ferries, fords, perrenial rivers: with canals, non-perennial, unsurveyed, swamps, wells, waterholes, ground liable to flooding, airports, flight and landing strips, water airports, post offices and post offices with telegraph or telephones, roadhouses, radio or transmission stations, lighthouses, customs offices, harbours, Christian missions, trigonometric or astronomical points, heights and form lines, elevation in metres. Relief shown by form lines with height in metres. Colour. Special edition. Scale 1 : 500 000.