The traditional county has a roughly trapezoidal shape; it consists of a fairly flat area along the Firth of Forth, which is heavily urbanised and dominated by the Edinburgh conurbation. Off the coast lie the small islands of Inchmickery and Cramond Island. The land gradually rises to the south, with the Pentland Hills in the south-west, Moorfoot Hills in the centre-south and the Lammermuir Hills in the far south-east. Blackhope Scar on the border with Peeblesshire is the highest point in the county at 651 m (2,136 ft). The county contains no lochs of any size, though there are many reservoirs, most notably Gladhouse Reservoir, Rosebery Reservoir, Edgelaw Reservoir, Loganlea Reservoir, Glencorse Reservoir, Threipmuir Reservoir, Harlaw Reservoir, Harperrig Reservoir, Crosswood Reservoir, Morton Reservoir and Cobbinshaw Reservoir.