Belfast is the second-largest city on the island of Ireland. It is the largest city in Northern Ireland, of which it is the capital, and in the province of Ulster. he city is situated at the south-western end of Belfast Lough, a long natural inlet ideal for the shipping trade that made the city famous, and near the mouth of the River Lagan. It is flanked by long stretches of hills, the Holywood Hills on the south and the Antrim Hills on the north. The city straddles the County Antrim and County Down boundary. The city recently gained the status of being the 2nd most popular city in the UK for short breaks. The name Belfast originates from the Irish Béal Feirste, or the mouth of the Farset (feirste is the genitive of the word fearsaid, "a spindle"), the river on which the city was built. Interestingly, the river Farset has been superseded by the River Lagan as the most important river; the Farset now languishes under the High Street in obscurity. Bridge Street indicates where there was originally a bridge across the Farset.