A large portion of the county is hilly, especially in the east, where the highest elevations are attained, though these are nowhere great. The range runs north and south, and, following this direction the highest points are Knocklayd (1,695 ft), Slieveanorra (1,676 ft), Trostan (1,817 ft), Slemish (1,457 ft) and Divis (1,567 ft). The inland slope is gradual, but on the northern shore the range terminates in abrupt and almost perpendicular declivities, and here, consequently, some of the finest coast scenery in the world is found, widely differing, with its unbroken lines of cliffs, from the indented coast-line of the west.

Two of Northern Ireland's main ports are in County Antrim, Larne and Belfast. Ferries sail from Larne Harbour to destinations including Cairnryan and Troon in Scotland, and Fleetwood in England. The Port of Belfast is Northern Ireland's principal maritime gateway, serving the Northern Ireland economy and increasingly that of the Republic of Ireland. It is a major centre of industry and commerce and has become established as the focus of logistics activity for Northern Ireland. Around two thirds of Northern Ireland's seaborne trade, and a quarter of that for Ireland as a whole, is handled at the port which receives over 9,000 vessels each year.

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