Parliamentary boundary post, McArt's Fort, Cavehill Country Park, Upper Hightown Road, Belfast, Co Antrim

A cast-iron boundary post dated 1918, unaltered and in its original setting at McArt's Fort in Cavehill Country Park.

The post is of slightly tapered cylindrical profile with a banded octagonal base and an oversailing flat octagonal top featuring a slightly smaller fluted circular cap. The front elevation, facing east, bears the shield of Belfast Corporation's coat of arms, below which is a curved plaque reading "Parliamentary/ and Municipal/ Boundary of/ Belfast/ Duncairn Division/ Clifton Ward/ 1918". The plaque is secured to the front of the post with four countersunk screws. The post retains its painted cast-iron finish.

The post marks the outer extent of the administrative jurisdiction of Belfast Corporation (as Belfast City Council was then known), specifically the boundary of Duncairn District Electoral Division and the part of Clifton Ward lying within it. It is positioned on the west side of McArt's Fort, on the inside face of the ditch enclosing the earthwork, just off the main gravelled footpath around the Country Park. The boundary it marks ran along the top edge of the basalt escarpment. To the east lies McArt's Fort itself; behind the post extends an area of undulating heather moorland now part of Cavehill Country Park.

The post dates from the redistribution of Belfast's constituencies under the Redistribution of Seats (Ireland) Act 1918, which increased the number of parliamentary divisions from four to nine. These new constituencies were first used in the General Election of 14 December 1918, held under the Representation of the People Act 1918. This election was historically significant as the first in which all men over 21 and all women over 30 could vote—marking the first time women had any parliamentary voting rights. It was also the first election to be completed within a single day. Sir Edward Carson was Duncairn's first MP.

Following the creation of the devolved parliament for Northern Ireland in 1922, the Duncairn parliamentary constituency, created only four years earlier, was abolished and the previous North Belfast seat restored. However, the municipal wards continued in use for local elections. Belfast Corporation itself was superseded by Belfast City Council in 1973, with extended jurisdiction beyond the former borough boundary. The post now lies within Cavehill District Electoral Division and Castle Ward as currently used for Council elections.

The post is relatively rare, as many such boundary markers have been lost to road widening and removal. It holds group value with another boundary post on the south side of McArt's Fort and two others on the Antrim Road, all marking the same electoral division and ward boundaries. These posts form part of the most complete group of administrative markers of their kind in the province.